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
9 lines
243 B
Text
9 lines
243 B
Text
/-
|
|
Copyright (c) 2015 Floris van Doorn. All rights reserved.
|
|
Released under Apache 2.0 license as described in the file LICENSE.
|
|
|
|
Module: algebra.category.default
|
|
Authors: Floris van Doorn
|
|
-/
|
|
|
|
import .category .strict .groupoid .constructions
|