feat(library/hott) add univalence axiom
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library/hott/axioms/ua.lean
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library/hott/axioms/ua.lean
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-- Copyright (c) 2014 Microsoft Corporation. All rights reserved.
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-- Released under Apache 2.0 license as described in the file LICENSE.
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-- Author: Jeremy Avigad, Jakob von Raumer
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-- Ported from Coq HoTT
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import hott.path hott.equiv
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open path Equiv
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axiom ua {A B : Type} [H : A ≃ B] : A ≈ B
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