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fix typos in README.md #37

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fix typos in README.md
lanceXwq Mar 27, 2024
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fix typos README.md
lanceXwq Mar 27, 2024
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8 changes: 4 additions & 4 deletions README.md
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[![ColPrac: Contributor's Guide on Collaborative Practices for Community Packages](https://img.shields.io/badge/ColPrac-Contributor's%20Guide-blueviolet)](https://github.com/SciML/ColPrac)


This is a package for extra Positive (Semi-) Definated Matrix types.
This is a package for extra Positive (Semi-) Definite Matrix types.
It is an extension to [PDMats.jl](https://github.com/JuliaStats/PDMats.jl).

It probably wouldn't exist, except Distributions.jl is currently very tied to the idea that the type of a covariance matrix should subtype `AbstractPDMat`.
There is [an issue open to change that](https://github.com/JuliaStats/Distributions.jl/issues/1219).
When that is resolve the matrix defined here may well move elsewhere, or cease to be required.
When that is resolved the matrix defined here may well move elsewhere, or cease to be required.

## The Matrixes

### PSDMat
A Positive Semi-Definite Matrix.
It still subtypes `AbstractPDMat`.
It's not quite as nice to work with as a truely positive definite matrix, since the math doesn't work out so well.
But this is able to represent all covariences -- which must be positive *semi*-definate.
It's not quite as nice to work with as a truly positive definite matrix, since the math doesn't work out so well.
But this is able to represent all covariances -- which must be positive *semi*-definite.
You might not like the consequences,

```julia
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