297d50378d
define embedding, (split) surjection, retraction, existential quantifier, 'or' connective also add a whole bunch of theorems about these definitions still has two sorry's which can be solved after #564 is closed |
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constructions | ||
adjoint.hlean | ||
category.hlean | ||
category.md | ||
default.hlean | ||
functor.hlean | ||
groupoid.hlean | ||
iso.hlean | ||
nat_trans.hlean | ||
precategory.hlean | ||
strict.hlean | ||
yoneda.hlean |