Refactor the 'Categories.Object.Zero' module #252
Merged
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As per @HuStmpHrrr's suggestion on #249, I've reworked the definition of zero objects to use
IsTerminal
andIsInitial
. I also made a couple of fixes to some rather silly mistakes I made when writing this module:Zero
zero
to𝟘
, to avoid conflicts withzero
fromLevel
,Data.Nat
, and many others!¡
and!
so that their types now make sense:¡ : 𝟘 ⇒ A
! : A ⇒ 𝟘
While I was at it, I added some autoduality proofs about zero objects that I need for cokernels.