From 634a896106e21ac16a9eff858ad600ea7d330a9a Mon Sep 17 00:00:00 2001
From: Marcos Benevides <marcos.schonfinkel@gmail.com>
Date: Fri, 11 Oct 2024 18:11:02 -0300
Subject: [PATCH] more notes

---
 config.toml                                   |  3 +
 content-org/content.org                       | 34 +++++---
 layouts/_default/baseof.html                  |  2 -
 layouts/_default/taxonomy.html                | 12 +++
 layouts/partials/graph.html                   |  2 +-
 layouts/partials/libs.html                    |  2 +
 notes/20211104221056-history_of_logic.org     |  2 +-
 .../20211107141903-the_effective_manager.org  |  4 +-
 ...1100120-managing_a_programming_project.org |  4 +-
 notes/20240706213027-programming_erlang.org   | 48 -----------
 ...20240715225258-type_driven_development.org |  8 +-
 notes/20240924122449-sequential_erlang.org    | 34 ++++++++
 notes/20240930224229-concurrent_erlang.org    | 84 ++++++++++++++++++-
 ...0241001192402-error_handling_in_erlang.org | 41 ++++++++-
 notes/20241008121957-haskell.org              | 11 +++
 notes/20241009092203-dializer.org             | 42 ++++++++++
 notes/20241009203936-management.org           |  4 +-
 notes/20241009215607-relational_theory.org    | 16 +++-
 notes/20241010093430-erlang_ets.org           | 10 +++
 notes/20241010094109-gen_server.org           | 10 +++
 notes/20241010155009-relational_algebra.org   |  6 ++
 .../20241011135148-functional_programming.org | 18 ++++
 notes/20241011135759-dependent_types.org      |  5 ++
 static/graph.json                             |  2 +-
 .../img/notes/erlang_error_exit_signals.png   |  3 +
 static/img/notes/erlang_error_trapping.png    |  3 +
 static/img/notes/erlang_selective.png         |  3 +
 static/img/notes/erlang_send.png              |  3 +
 static/img/notes/erlang_spawn.png             |  3 +
 static/img/notes/erlang_timeout.png           |  3 +
 30 files changed, 345 insertions(+), 77 deletions(-)
 create mode 100644 layouts/_default/taxonomy.html
 delete mode 100644 notes/20240706213027-programming_erlang.org
 create mode 100644 notes/20241010093430-erlang_ets.org
 create mode 100644 notes/20241010094109-gen_server.org
 create mode 100644 notes/20241010155009-relational_algebra.org
 create mode 100644 notes/20241011135148-functional_programming.org
 create mode 100644 notes/20241011135759-dependent_types.org
 create mode 100644 static/img/notes/erlang_error_exit_signals.png
 create mode 100644 static/img/notes/erlang_error_trapping.png
 create mode 100644 static/img/notes/erlang_selective.png
 create mode 100644 static/img/notes/erlang_send.png
 create mode 100644 static/img/notes/erlang_spawn.png
 create mode 100644 static/img/notes/erlang_timeout.png

diff --git a/config.toml b/config.toml
index a0143cb..bbf8b22 100644
--- a/config.toml
+++ b/config.toml
@@ -18,6 +18,9 @@ assetDir = "static"
   blog = "/blog/:year/:slug/"
   notes = "/notes/:year/:slug/"
 
+[taxonomies]
+  category = 'categories'
+  tag = 'tags'
 
 [mediaTypes."application/atom+xml"]
   suffixes = ["xml"]
diff --git a/content-org/content.org b/content-org/content.org
index c77d67f..e2c2d62 100644
--- a/content-org/content.org
+++ b/content-org/content.org
@@ -120,6 +120,28 @@ This is the place where I dump my [[https://www.orgroam.com/][Org ROAM]] notes.
 
 #+RESULTS: export-notes
 
+** Gen Server
+:PROPERTIES:
+:EXPORT_FILE_NAME: gen-server
+:EXPORT_DATE: 2024-10-10
+:EXPORT_HUGO_CUSTOM_FRONT_MATTER: :slug gen-server
+:CUSTOM_ID: gen-server
+:END:
+
+#+INCLUDE: "../notes/20241010094109-gen_server.org"
+    
+
+** Erlang Ets
+:PROPERTIES:
+:EXPORT_FILE_NAME: erlang-ets
+:EXPORT_DATE: 2024-10-10
+:EXPORT_HUGO_CUSTOM_FRONT_MATTER: :slug erlang-ets
+:CUSTOM_ID: erlang-ets
+:END:
+
+#+INCLUDE: "../notes/20241010093430-erlang_ets.org"
+    
+
 ** Relational Theory
 :PROPERTIES:
 :EXPORT_FILE_NAME: relational-theory
@@ -516,17 +538,6 @@ This is the place where I dump my [[https://www.orgroam.com/][Org ROAM]] notes.
 #+INCLUDE: "../notes/20240709110323-designing_for_scalability_with_erlang.org"
     
 
-** Programming Erlang
-:PROPERTIES:
-:EXPORT_FILE_NAME: programming-erlang
-:EXPORT_DATE: 2024-07-06
-:EXPORT_HUGO_CUSTOM_FRONT_MATTER: :slug programming-erlang
-:CUSTOM_ID: programming-erlang
-:END:
-
-#+INCLUDE: "../notes/20240706213027-programming_erlang.org"
-    
-
 ** Monad
 :PROPERTIES:
 :EXPORT_FILE_NAME: monad
@@ -812,4 +823,3 @@ This is the place where I dump my [[https://www.orgroam.com/][Org ROAM]] notes.
 
 #+INCLUDE: "../notes/20211012215602-kubernetes.org"
     
-
diff --git a/layouts/_default/baseof.html b/layouts/_default/baseof.html
index d9f0014..cdbc2ec 100644
--- a/layouts/_default/baseof.html
+++ b/layouts/_default/baseof.html
@@ -14,8 +14,6 @@
     {{ if .Param "libs" }}
         {{ partialCached "libs.html" . }}
     {{ end }}
-    <link href='https://unpkg.com/boxicons@2.1.4/css/boxicons.min.css' rel='stylesheet'>
-    <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/7.9.0/d3.min.js"></script>
   </head>
   <body>
       {{- partial "nav.html" -}}
diff --git a/layouts/_default/taxonomy.html b/layouts/_default/taxonomy.html
new file mode 100644
index 0000000..e7323df
--- /dev/null
+++ b/layouts/_default/taxonomy.html
@@ -0,0 +1,12 @@
+{{ define "main" }}
+  <h1>{{ .Title }}</h1>
+  {{ .Content }}
+  {{ range .Data.Terms.Alphabetical }}
+    <h2><a href="{{ .Page.RelPermalink }}">{{ .Page.LinkTitle }}</a> ({{ .Count }})</h2>
+    <ul>
+      {{ range .WeightedPages }}
+        <li><a href="{{ .RelPermalink }}">{{ .LinkTitle }}</a></li>
+      {{ end }}
+    </ul>
+  {{ end }}
+{{ end }}
diff --git a/layouts/partials/graph.html b/layouts/partials/graph.html
index 3d2659f..4e14800 100644
--- a/layouts/partials/graph.html
+++ b/layouts/partials/graph.html
@@ -1,6 +1,6 @@
 <svg id="note-graph" class="rounded-lg"></svg>
 <script>
-var graph_data = {"directed": true, "multigraph": false, "graph": {}, "nodes": [{"label": "The Mother of All Demos", "tooltip": "The Mother of All Demos", "lnk": "20231018195150-the_mother_of_all_demos", "id": "\"116d7265-e46f-4b42-b5ef-af1e913e2c12\"", "centrality": 0.15072717685771722, "communityLabel": 0}, {"label": "Hypermedia Systems", "tooltip": "Hypermedia Systems", "lnk": "20231015192823-hypermediasystems", "id": "\"10d70300-3c11-48f7-af3b-d5d07d5a5f39\"", "centrality": 0.49043630611463024, "communityLabel": 0}, {"label": "Helm", "tooltip": "Helm", "lnk": "20211023140908-helm", "id": "\"b9376a33-534c-4468-a788-df96a642a8e2\"", "centrality": 0.1257329053324047, "communityLabel": 1}, {"label": "Architectural Styles and the Design of Network-based Software Architectures", "tooltip": "Architectural Styles and the Design of Network-based Software Architectures", "lnk": "20231018195743-architectural_styles_and_the_design_of_network_based_software_architectures", "id": 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"id": "\"bd5dba58-0dd8-4b89-aabb-8bd49ed8c27c\"", "centrality": 0.1257329053324047, "communityLabel": 4}, {"label": "kubectl", "tooltip": "kubectl", "lnk": "20211013230422-kubectl", "id": "\"ee377537-0c8d-48c9-a181-19a2cff8c4a7\"", "centrality": 0.13485667545087898, "communityLabel": 6}, {"label": "GitOps", "tooltip": "GitOps", "lnk": "20211201115324-gitops", "id": "\"e670c5d9-8238-4bf4-a916-e9ffb3097fa1\"", "centrality": 0.27569853448427956, "communityLabel": 6}, {"label": "As We May Think", "tooltip": "As We May Think", "lnk": "20231018194552-as_we_may_think", "id": "\"22759a84-3a09-464f-b0f7-e5d0a7bf5295\"", "centrality": 0.15072717685771722, "communityLabel": 0}, {"label": "Kubernetes-Secrets", "tooltip": "Kubernetes-Secrets", "lnk": "20211108165331-kubernetes_secrets", "id": "\"2bdf666d-f2a0-410a-a46a-45815fdf7285\"", "centrality": 0.1257329053324047, "communityLabel": 4}, {"label": "mandarin-chinese", "tooltip": "mandarin-chinese", "lnk": "20220204231800-mandarin_chinese", "id": 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diff --git a/layouts/partials/libs.html b/layouts/partials/libs.html
index 9601a95..159b271 100644
--- a/layouts/partials/libs.html
+++ b/layouts/partials/libs.html
@@ -1,4 +1,6 @@
 <script type="text/javascript" src ="https://d3js.org/d3.v7.min.js"></script>
+<link href='https://unpkg.com/boxicons@2.1.4/css/boxicons.min.css' rel='stylesheet'>
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diff --git a/notes/20211104221056-history_of_logic.org b/notes/20211104221056-history_of_logic.org
index bab0965..317bd52 100644
--- a/notes/20211104221056-history_of_logic.org
+++ b/notes/20211104221056-history_of_logic.org
@@ -1,7 +1,7 @@
 :PROPERTIES:
 :ID:       0c082d02-4771-4860-8119-83b263c00ff3
 :END:
-#+title: History-of-Logic
+#+title: History of Logic
 
 Notes from the book "History of Logic: from Aristotle to Tarski".
 
diff --git a/notes/20211107141903-the_effective_manager.org b/notes/20211107141903-the_effective_manager.org
index 8f6dcc3..6bc594d 100644
--- a/notes/20211107141903-the_effective_manager.org
+++ b/notes/20211107141903-the_effective_manager.org
@@ -2,8 +2,8 @@
 :ID:       32b2fe5a-3bc3-439b-a850-70a539498e9e
 :END:
 #+title: The Effective Manager
-#+HUGO_CATEGORIES: "Management"
-#+HUGO_TAGS: "Books"
+#+HUGO_CATEGORIES: "Leadership"
+#+HUGO_TAGS: "Management"
 
 Notes from the [cite:@horstman2023effective].
 
diff --git a/notes/20230411100120-managing_a_programming_project.org b/notes/20230411100120-managing_a_programming_project.org
index ee34d3a..2198497 100644
--- a/notes/20230411100120-managing_a_programming_project.org
+++ b/notes/20230411100120-managing_a_programming_project.org
@@ -2,8 +2,8 @@
 :ID:       da4d5031-66cb-4d1c-b8cf-24d12adf5c17
 :END:
 #+title: Managing a Programming Project
-#+HUGO_CATEGORIES: "Management"
-#+HUGO_TAGS: "Books"
+#+HUGO_CATEGORIES: "Leadership"
+#+HUGO_TAGS: "Management"
 
 Notes from [cite:@metzger1996].
 
diff --git a/notes/20240706213027-programming_erlang.org b/notes/20240706213027-programming_erlang.org
deleted file mode 100644
index abadab6..0000000
--- a/notes/20240706213027-programming_erlang.org
+++ /dev/null
@@ -1,48 +0,0 @@
-:PROPERTIES:
-:ID:       1daea4ea-40bc-406d-8d03-906c7f9ec343
-:EXPORT_HUGO_CATEGORIES: "FP"
-:EXPORT_HUGO_TAGS: "Erlang"
-:END:
-#+TITLE: Programming Erlang
-
-Notes from [cite:@armstrong2013].
-
-[[id:de7d0e94-618f-4982-b3e5-8806d88cad5d][Erlang]]
-
-* Part II: Sequential Programming
-
-** Error Handling in Sequential Programs
-
-#+BEGIN_SRC erlang
-  try FuncOrExpressionSeq of
-    Pattern1 [when Guard1] -> Expressions1;
-    Pattern2 [when Guard2] -> Expressions2;
-    ...
-  catch
-    ExceptionType1: ExPattern1 [when ExGuard1] -> ExExpressions1;
-    ExceptionType2: ExPattern2 [when ExGuard2] -> ExExpressions2;
-    ...
-  after
-    AfterExpressions
-  end
-#+END_SRC
-
-+ ~exit/1~ :: Used to terminate the current process.
-+ ~throw~ :: Used as a documentation to the caller, to show that a function might throw this exception. 
-+ error :: Crashing errors.
-
-*** Fail Fast and Noisily, Fail Politely
-
-#+BEGIN_QUOTE
-In Erlang, when an error is detected internally by the system or is detected by
-program logic, the correct approach is to crash immediately and generate a
-meaningful error message.
-
-(...)
-
-Second, fail politely means that only the programmer should see the detailed
-error messages produced when a program crashes. A user of the program should
-never see these messages.
-#+END_QUOTE
-
-** Binaries and the Bit Syntax
diff --git a/notes/20240715225258-type_driven_development.org b/notes/20240715225258-type_driven_development.org
index 56490d7..c17b8e5 100644
--- a/notes/20240715225258-type_driven_development.org
+++ b/notes/20240715225258-type_driven_development.org
@@ -3,7 +3,13 @@
 :END:
 #+title: Type-Driven Development with Idris
 #+HUGO_CATEGORIES: "Functional Programming"
-#+HUGO_TAGS: "Idris" "Type-Driven Development"
+#+HUGO_TAGS: "Idris"
+
+#+BEGIN_QUOTE
+Idris is a pure [[id:171718cd-10fd-484b-8d77-0ffcffc29163][Functional Programming]] language with [[id:7580b45a-1dba-4690-bfbf-652fee25e1d9][Dependent Types]]
+#+END_QUOTE
 
 + References:
   + [cite:@brady2017]
+
+#+print_bibliography: 
diff --git a/notes/20240924122449-sequential_erlang.org b/notes/20240924122449-sequential_erlang.org
index 247f9ac..c46c2bd 100644
--- a/notes/20240924122449-sequential_erlang.org
+++ b/notes/20240924122449-sequential_erlang.org
@@ -223,4 +223,38 @@ If we want additional control structures, we can make our own. Erlang has no for
     mps_to_kph(Mps) -> 3.6 * Mps.
 #+END_SRC
 
+* Error Handling in Sequential Programs
+
+#+BEGIN_SRC erlang
+  try FuncOrExpressionSeq of
+    Pattern1 [when Guard1] -> Expressions1;
+    Pattern2 [when Guard2] -> Expressions2;
+    ...
+  catch
+    ExceptionType1: ExPattern1 [when ExGuard1] -> ExExpressions1;
+    ExceptionType2: ExPattern2 [when ExGuard2] -> ExExpressions2;
+    ...
+  after
+    AfterExpressions
+  end
+#+END_SRC
+
++ ~exit/1~ :: Used to terminate the current process.
++ ~throw~ :: Used as a documentation to the caller, to show that a function might throw this exception. 
++ error :: Crashing errors.
+
+*** Fail Fast and Noisily, Fail Politely
+
+#+BEGIN_QUOTE
+In Erlang, when an error is detected internally by the system or is detected by
+program logic, the correct approach is to crash immediately and generate a
+meaningful error message.
+
+(...)
+
+Second, fail politely means that only the programmer should see the detailed
+error messages produced when a program crashes. A user of the program should
+never see these messages.
+#+END_QUOTE
+
 #+print_bibliography: 
diff --git a/notes/20240930224229-concurrent_erlang.org b/notes/20240930224229-concurrent_erlang.org
index 7513ed3..1788e61 100644
--- a/notes/20240930224229-concurrent_erlang.org
+++ b/notes/20240930224229-concurrent_erlang.org
@@ -1,10 +1,10 @@
 :PROPERTIES:
 :ID:       63607e63-4428-4578-bf2a-12a49649b49c
-:ROAM_ALIAS: "Erlang Process"
 :END:
 #+title: Concurrent Erlang
 #+HUGO_CATEGORIES: "Functional Programming"
 #+HUGO_TAGS: "Erlang"
+#+STARTUP: inlineimages
 
 * Processes
 
@@ -16,6 +16,22 @@ identifier (PID) that can used to interact with the newly created process:
 Pid = spawn(ModName, FuncName, [Arg1, Arg2, ..., ArgN]).
 #+END_SRC
 
+#+NAME: erlang-spawn
+#+BEGIN_SRC dot :file ../static/img/notes/erlang_spawn.png :cmdline -Kdot -Tpng :exports results
+  digraph Spawn {
+    node [shape=circle];
+    sep = 1;
+
+    pid1 [label="Pid 1", fontsize="10pt", style=filled, fillcolor=grey];
+    pid2 [label="Pid 2", xlabel="Mod:Func(Args)", fontsize="10pt", style=filled, fillcolor=red];
+
+    pid1 -> pid2 [label="  Spawn(Mod, Func, Args)", fontsize="10pt", minlen=1, style=dashed];
+  }
+#+END_SRC
+
+#+RESULTS: erlang-spawn
+[[file:../static/img/notes/erlang_spawn.png]]
+
 + This BIF never fails
 + A process can either terminate:
   * Abormally when run-time errors occur
@@ -23,6 +39,22 @@ Pid = spawn(ModName, FuncName, [Arg1, Arg2, ..., ArgN]).
 
 ** Modeling Concurrency
 
+#+NAME: erlang-send
+#+BEGIN_SRC dot :file ../static/img/notes/erlang_send.png :cmdline -Kdot -Tpng :exports results
+  digraph Send {
+    node [shape=circle];
+    rankdir="LR";
+
+    pid1 [label="Pid 1", xlabel="Pid2 ! { self(), hello }", fontsize="10pt", style=filled, fillcolor=grey];
+    pid2 [label="Pid 2", fontsize="10pt", style=filled, fillcolor=red, xlabel="receive (...) end." ];
+
+    pid1 -> pid2 [label="{ Pid1, hello }", fontsize="10pt", style=dashed];
+  }
+#+END_SRC
+
+#+RESULTS: erlang-send
+[[file:../static/img/notes/erlang_send.png]]
+
 The syntax ~Pid ! Msg~ means "send the message ~Msg~ to the process ~Pid~", where ~Msg~
 is from any valid [[id:de7d0e94-618f-4982-b3e5-8806d88cad5d][Erlang]] data type. For a ~Pid~ to process a message we need to
 pattern match:
@@ -50,10 +82,39 @@ end
 
   + Messages can be matched and selectivelly retrieved
 
-    #+BEGIN_SRC erlang
+    #+NAME: erlang-seletive
+    #+BEGIN_SRC dot :file ../static/img/notes/erlang_selective.png :cmdline -Kdot -Tpng :exports results
+      digraph Selective {
+          node [shape=circle];
+          rankdir="LR";
+          sep = 1;
 
+          pid1 [label="Pid 1", xlabel="Pid 3 ! { foo, ... }", fontsize="10pt", style=filled, fillcolor=grey];
+          pid2 [label="Pid 2", xlabel="Pid 3 ! { bar, ... }", fontsize="10pt", style=filled, fillcolor=grey];
+          pid3 [label="Pid 3", fontsize="10pt", style=filled, fillcolor=red];
+
+          pid1 -> pid3 [label="{foo, ...}", fontsize="10pt", minlen=1, style=dashed];
+          pid2 -> pid3 [label="{bar, ...}", fontsize="10pt", minlen=1, style=dashed];
+      }
+    #+END_SRC
+
+    #+RESULTS: erlang-seletive
+    [[file:../static/img/notes/erlang_selective.png]]
+
+    #+BEGIN_SRC erlang
+      receive
+        {foo, _} ->
+        (...)
+      end,
+      (...)
+      receive
+        {bar, _} ->
+        (...)
+      end,
     #+END_SRC
 
+    this way the message ~{foo, ...}~ is received before the message ~{bar, ...}~.
+
   + Messages are received when a message matches a clause
   + Mailboxes are scanned sequentially
 
@@ -74,6 +135,25 @@ end
   executed. Otherwise, ~expr02~ will be executed.
 + ~TimeOut~ is an integer denoting the time in miliseconds or the Atom ~infinity~.
 
+#+NAME: erlang-timeout
+#+BEGIN_SRC dot :file ../static/img/notes/erlang_timeout.png :cmdline -Kdot -Tpng :exports results
+  digraph Timeout {
+      node [shape=circle];
+      rankdir="LR";
+      sep = 1;
+
+      timeout [label="🕒", fontsize="10pt", style=filled, fillcolor=white];
+      pid1 [label="Pid 1", fontsize="10pt", style=filled, fillcolor=grey];
+      pid2 [label="Pid 2", fontsize="10pt", style=filled, fillcolor=red];
+
+      timeout -> pid2 [label="Timeout", fontsize="10pt", minlen=1, style=dashed];
+      pid1 -> pid2 [label="Msg", fontsize="10pt", minlen=1, style=dashed];
+  }
+#+END_SRC
+
+#+RESULTS: erlang-timeout
+[[file:../static/img/notes/erlang_timeout.png]]
+
 #+BEGIN_SRC erlang
   receive 
     Msg ->
diff --git a/notes/20241001192402-error_handling_in_erlang.org b/notes/20241001192402-error_handling_in_erlang.org
index 57235e0..5b3425f 100644
--- a/notes/20241001192402-error_handling_in_erlang.org
+++ b/notes/20241001192402-error_handling_in_erlang.org
@@ -36,7 +36,9 @@ P3.
 + ~unlink/1~ removes the link to ~Pid~.
 
 ** Exit Signals
-+ Exit Signals can be *normal* or *abnormal*.
++ A process can termination can be *normal* or *abnormal*.
+  * *Normal*: When there is no more code to execute.
+  * *Abnormal*: When runtime errors occur.
 + When a process terminates, it sends a signal to all process its linked to. The
   exit signal will contain the following information:
 
@@ -47,6 +49,23 @@ P3.
  | The ~link~ flag       | This flag will be set indicating that the exit signal was sent due to a link.           |
  | ~exit~ reason       |                                                                                         |
 
+#+NAME: erlang-error-exit-signals
+#+BEGIN_SRC dot :file ../static/img/notes/erlang_error_exit_signals.png :cmdline -Kdot -Tpng :exports results
+  digraph Link {
+      node [shape=circle];
+      rankdir="LR";
+      sep = 1;
+
+      pid1 [label="Pid 1", fontsize="10pt", style=filled, fontcolor=white; fillcolor=black];
+      pid2 [label="Pid 2", fontsize="10pt", style=filled, fillcolor=grey];
+
+      pid1 -> pid2 [label="{'Exit', Pid1, Reason}", dir=both, fontsize="10pt", minlen=1, style=dashed];
+  }
+#+END_SRC
+
+#+RESULTS: erlang-error-exit-signals
+[[file:../static/img/notes/erlang_error_exit_signals.png]]
+
 ** Error Trapping
 
 *** Propagation Semantics
@@ -54,4 +73,24 @@ P3.
 + Processes can trap ~exit~ signals by calling the BIF ~process_flag(trap_exit, true)~.
 + Once trapped, the errors are saved in the mailbox.
 
+#+NAME: erlang-error-trapping
+#+BEGIN_SRC dot :file ../static/img/notes/erlang_error_trapping.png :cmdline -Kdot -Tpng :exports results
+  digraph Trapping {
+      node [shape=circle];
+      rankdir="LR";
+      sep = 1;
+
+      pid1 [label="Pid 1", fontsize="10pt", style=filled, fontcolor=white; fillcolor=black];
+      pid2 [label="Pid 2", fontsize="10pt", style=filled, fillcolor=grey; shape=doublecircle];
+      pid3 [label="Pid 3", fontsize="10pt", style=filled, fillcolor=grey];
+
+
+      pid1 -> pid2 [label="{'Exit', Pid1, Reason}", dir=both, fontsize="10pt", minlen=1, style=dashed];
+      pid2 -> pid3 [dir=both, fontsize="10pt", minlen=2, style=dashed];
+  }
+#+END_SRC
+
+#+RESULTS: erlang-error-trapping
+[[file:../static/img/notes/erlang_error_trapping.png]]
+
 #+print_bibliography:
diff --git a/notes/20241008121957-haskell.org b/notes/20241008121957-haskell.org
index d1fd31c..8d0b761 100644
--- a/notes/20241008121957-haskell.org
+++ b/notes/20241008121957-haskell.org
@@ -4,3 +4,14 @@
 #+title: Haskell
 #+HUGO_CATEGORIES: "Functional Programming"
 #+HUGO_TAGS: "Haskell"
+
+#+begin_quote
+Haskell is a general purpose, purely [[id:171718cd-10fd-484b-8d77-0ffcffc29163][Functional Programming]] language
+incorporating many recent innovations in programming language design. Haskell
+provides higher-order functions, non-strict semantics, static polymorphic
+typing, user-defined algebraic datatypes, pattern-matching, list comprehensions,
+a module system, a monadic I/O system, and a rich set of primitive datatypes,
+including lists, arrays, arbitrary and fixed precision integers, and
+floating-point numbers. Haskell is both the culmination and solidification of
+many years of research on non-strict functional languages.
+#+end_quote
diff --git a/notes/20241009092203-dializer.org b/notes/20241009092203-dializer.org
index 8a33134..5b06d79 100644
--- a/notes/20241009092203-dializer.org
+++ b/notes/20241009092203-dializer.org
@@ -8,3 +8,45 @@
 Dialyzer is a static analysis tool that identifies software discrepancies, such
 as definite type errors, code that is unreachable because of programming errors,
 and unnecessary tests in [[id:de7d0e94-618f-4982-b3e5-8806d88cad5d][Erlang]] and [[id:8d568d81-9c22-4d94-81b2-27a2d730ba98][Elixir]] modules or an entire codebases.
+
+* Erlang Type Notation
+We can define a subset of Erlang types as follows:
+#+BEGIN_SRC 
+Type ::
+      any()
+    | none()
+    | pid()
+    | port()
+    | reference()
+    | []
+    | Atom
+    | binary()
+    | float()
+    | Fun
+    | Integer
+    | [Type]
+    | Tuple
+    | Union
+    | UserDefined
+Union :: Type1 | Type2 | ...
+Atom :: atom() | Erlang_Atom
+Integer :: integer() | Min .. Max
+Fun :: fun() | fun((...) -> Type)
+Tuple :: tuple() | {T1, T2, ... Tn}
+#+END_SRC
+
+New types can be defined with the following syntax:
+#+begin_src 
+  -type NewTypeName(TVar1, TVar2, ... , TVarN) :: Type.
+#+end_src
+
+** Specifying the Input and Output Types of a Function
+
+#+BEGIN_SRC 
+-spec file:open(FileName, Modes) -> {ok, Handle} | {error, Why} when
+    FileName :: string(),
+    Modes :: [Mode],
+    Mode :: read | write | ...
+    Handle :: file_handle(),
+    Why :: error_term().
+#+END_SRC
diff --git a/notes/20241009203936-management.org b/notes/20241009203936-management.org
index b648ad9..50400a7 100644
--- a/notes/20241009203936-management.org
+++ b/notes/20241009203936-management.org
@@ -2,8 +2,8 @@
 :ID:       1d989967-2878-40ab-827d-c4d1a91e0011
 :END:
 #+title: Management
-#+HUGO_CATEGORIES: "Management"
-#+HUGO_TAGS: "Books"
+#+HUGO_CATEGORIES: "Leadership"
+#+HUGO_TAGS: "Management"
 
 * Books
 + [[id:da4d5031-66cb-4d1c-b8cf-24d12adf5c17][Managing a Programming Project]]
diff --git a/notes/20241009215607-relational_theory.org b/notes/20241009215607-relational_theory.org
index 38a5b7b..664cd78 100644
--- a/notes/20241009215607-relational_theory.org
+++ b/notes/20241009215607-relational_theory.org
@@ -15,7 +15,16 @@ appeared in an IBM Research Report in 1969 (...) [cite:@date2015sql].
 
 * Date's Review of Codd's Original Algebra
 
+The relational model defines a database abstraction based on relations to avoid maintenance overhead. It
+has three key ideas:
+
++ Store database in simple data structures (relations).
++ Physical storage left up to the DBMS implementation.
++ Access data through a high-level language, where the DBMS figures out best execution strategy.
+
 ** Structure
+The definition of relations and their contents independent of their physical representation
+
 *** Types (or Domains)
 *** n-Ary Relations
 *** Attributes & Tuples
@@ -25,11 +34,14 @@ appeared in an IBM Research Report in 1969 (...) [cite:@date2015sql].
 **** Foreign
 
 ** Integrity
+Ensure the database's contents satisfy certain constraints
 *** Entity Integrity
 *** Referential Integrity
 
 ** Manipulation
-*** Relational Algebra
-*** Relational Assignment
+Programming interface for accessing and modifying a database's contents
+
++ [[id:11914357-b272-40fc-8bf6-a0ff98af0c99][Relational Algebra]]
++ Relational Assignment
 
 #+print_bibliography: 
diff --git a/notes/20241010093430-erlang_ets.org b/notes/20241010093430-erlang_ets.org
new file mode 100644
index 0000000..29b024c
--- /dev/null
+++ b/notes/20241010093430-erlang_ets.org
@@ -0,0 +1,10 @@
+:PROPERTIES:
+:ID:       37c6ea44-0c80-4c57-a36e-98d37e8a3413
+:ROAM_ALIAS: "ETS"
+:END:
+#+title: Erlang ETS
+#+HUGO_CATEGORIES: "Functional Programming"
+#+HUGO_TAGS: "Erlang" "Elixir" "OTP"
+
+Erlang Term Storage, commonly referred to as ETS, is a powerful storage engine
+built into [[id:6ed3a191-0128-453e-b0b6-37c48593a6f0][OTP]].
diff --git a/notes/20241010094109-gen_server.org b/notes/20241010094109-gen_server.org
new file mode 100644
index 0000000..e9d40ce
--- /dev/null
+++ b/notes/20241010094109-gen_server.org
@@ -0,0 +1,10 @@
+:PROPERTIES:
+:ID:       1cd8fd81-a7c4-44ea-8b7a-d803e9b491af
+:END:
+#+title: gen_server
+#+HUGO_CATEGORIES: "Functional Programming"
+#+HUGO_TAGS: "Erlang" "Elixir" "OTP"
+
+~gen_server~ is a generic server process that implements a standard set of
+interface functions and functionality for tracing and error reporting, it also
+fits an [[id:6ed3a191-0128-453e-b0b6-37c48593a6f0][OTP]] supervision tree.
diff --git a/notes/20241010155009-relational_algebra.org b/notes/20241010155009-relational_algebra.org
new file mode 100644
index 0000000..da8f5fc
--- /dev/null
+++ b/notes/20241010155009-relational_algebra.org
@@ -0,0 +1,6 @@
+:PROPERTIES:
+:ID:       11914357-b272-40fc-8bf6-a0ff98af0c99
+:END:
+#+title: Relational Algebra
+#+HUGO_CATEGORIES: "Databases"
+#+HUGO_TAGS: "Relational Theory"
diff --git a/notes/20241011135148-functional_programming.org b/notes/20241011135148-functional_programming.org
new file mode 100644
index 0000000..cf43114
--- /dev/null
+++ b/notes/20241011135148-functional_programming.org
@@ -0,0 +1,18 @@
+:PROPERTIES:
+:ID:       171718cd-10fd-484b-8d77-0ffcffc29163
+:END:
+#+title: Functional Programming
+#+HUGO_CATEGORIES: "Functional Programming"
+
+#+begin_quote
+We often refer to the term functional programming, meaning the following programming techniques:
+
++ Composing functions for structuring programs and using recursion instead of loops.
++ Purity, so that the result of a function is fully determined once its parameters have been fixed.
++ Absence of side effects (doing literally nothing except evaluating the result).
++ Immutability (the inability to change the value of a variable).
+
+[cite:@bragilevsky2021haskell, p.xix]
+#+end_quote
+
+#+print_bibliography: 
diff --git a/notes/20241011135759-dependent_types.org b/notes/20241011135759-dependent_types.org
new file mode 100644
index 0000000..e2d5ebe
--- /dev/null
+++ b/notes/20241011135759-dependent_types.org
@@ -0,0 +1,5 @@
+:PROPERTIES:
+:ID:       7580b45a-1dba-4690-bfbf-652fee25e1d9
+:END:
+#+title: Dependent Types
+
diff --git a/static/graph.json b/static/graph.json
index 5a8be07..47c6203 100644
--- a/static/graph.json
+++ b/static/graph.json
@@ -1 +1 @@
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