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Define null-homotopic maps #1136
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…-homotopies is a proposition
I'm briefly marking this PR as a draft to add a computation. |
We can also consider calling null-homotopic maps "constant" and then refer to constant maps as "standard constant maps". |
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I unabstract
ed the is-equiv
proofs in this file as everything holds by refl
, thus everything computes very nicely.
Defines null-homotopic maps and characterizes their equality. In particular, a sufficient condition for when being null-homotopic is a property is given.