Add D() methods to fractions, and allow parentheses in limited context #1172
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This PR addresses the differentiation issue raised in #1168. The solution presented here is to add
D()
methods to the division and space classes that return 0 (since a fraction or a mixed number is constant). My comment in that discussion explains why my earlier idea of usingAUTOLOAD
is not the right one, and why this is the correct one.This also redefines the parenthesis in the
LimitedFraction
context so that-(1/2)
will parse from MathQuill.I may need to make a similar PR for
contextUnits.pl
that adds differentiation there (I haven't looked into that yet).