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.md | ||
default.hlean | ||
functor.hlean | ||
hset.hlean | ||
opposite.hlean | ||
product.hlean |