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Commit 2020-10-03 04:08 6ab3eb7c

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chore(category_theory/limits/equalizers): some equalizer fixups (#4372) A couple of minor changes for equalizers:

Add some simps attributes
Removes some redundant brackets
Simplify the construction of an iso between cones (+dual)
Show the equalizer fork is a limit (+dual)

Estimated changes

Modified src/category_theory/limits/shapes/equalizers.lean

added def category_theory.limits.coequalizer_is_coequalizer

modified theorem category_theory.limits.cofork.condition

modified def category_theory.limits.cofork.ext

added def category_theory.limits.equalizer_is_equalizer

modified theorem category_theory.limits.fork.condition

modified def category_theory.limits.fork.ext