Fri, 23 Feb 2018 19:25:37 +0100 wenzelm added HOLogic.mk_obj_eq convenience and eliminated some clones;
Fri, 23 Feb 2018 17:59:57 +0100 wenzelm tuned -- use existing Morphism.instantiate_morphism;
Fri, 23 Feb 2018 16:03:26 +0000 Wenda Li Merged;
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