lean2/hott/algebra/category/constructions/default.hlean
Floris van Doorn e96e4a677d feat(homotopy): prove the naive Seifert-Van Kampen theorem
Also define the pushout of categories and the pushout of groupoids
2016-07-09 10:20:21 -07:00

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/-
Copyright (c) 2015 Floris van Doorn. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Authors: Floris van Doorn
-/
import .functor .set .opposite .product .comma .sum .discrete .indiscrete .terminal .initial .order
.pushout .fundamental_groupoid