feat(library/hott) Ported part of UnivalenceImpliesFunext.v
feat(library/hott) Ported part of UnivalenceImpliesFunext.v

rlewis1988/lean,leanprover/lean,soonhokong/lean-osx,c-cube/lean,htzh/lean,javra/lean,soonhokong/lean,digama0/lean,c-cube/lean,eigengrau/lean,fpvandoorn/lean,leodemoura/lean,Kha/lean,fgdorais/lean,c-cube/lean,sp3ctum/lean,dselsam/lean,soonhokong/lean-windows,leanprover/lean,leodemoura/lean,rlewis1988/lean,sp3ctum/lean,leodemoura/lean,fgdorais/lean,dselsam/lean,Kha/lean,rlewis1988/lean,johoelzl/lean,fgdorais/lean,dselsam/lean,UlrikBuchholtz/lean,avigad/lean,soonhokong/lean-windows,leanprover-community/lean,fpvandoorn/lean,rlewis1988/lean,levnach/lean,johoelzl/lean,dselsam/lean,javra/lean,fgdorais/lean,eigengrau/lean,leanprover-community/lean,fpvandoorn/lean,UlrikBuchholtz/lean,johoelzl/lean,htzh/lean,digama0/lean,johoelzl/lean,leanprover/lean,Kha/lean,soonhokong/lean,soonhokong/lean,fpvandoorn/lean2,avigad/lean,johoelzl/lean,eigengrau/lean,leodemoura/lean,digama0/lean,soonhokong/lean-windows,soonhokong/lean-osx,soonhokong/lean-osx,sp3ctum/lean,digama0/lean,avigad/lean,levnach/lean,htzh/lean,soonhokong/lean-windows,fpvandoorn/lean,javra/lean,javra/lean,soonhokong/lean-osx,UlrikBuchholtz/lean,soonhokong/lean,htzh/lean,leodemoura/lean,fpvandoorn/lean,htzh/lean,leanprover/lean,levnach/lean,fpvandoorn/lean2,leanprover-community/lean,Kha/lean,leanprover-community/lean,fpvandoorn/lean2,leanprover/lean,digama0/lean,leodemoura/lean,fpvandoorn/lean,Kha/lean,leanprover-community/lean,sp3ctum/lean,fgdorais/lean,levnach/lean,sp3ctum/lean,avigad/lean,fpvandoorn/lean2,Kha/lean,c-cube/lean,avigad/lean,dselsam/lean,c-cube/lean,fgdorais/lean,eigengrau/lean,UlrikBuchholtz/lean,javra/lean,leanprover/lean,soonhokong/lean-osx,leanprover-community/lean,digama0/lean,dselsam/lean,rlewis1988/lean,johoelzl/lean,levnach/lean,soonhokong/lean,eigengrau/lean,soonhokong/lean-windows,rlewis1988/lean,fpvandoorn/lean2,avigad/lean,UlrikBuchholtz/lean