We define strict and weak duality involutions on 2-categories, and prove a coherence theorem that every bicategory with a weak duality involution is biequivalent to a 2-category with a strict duality involution.
Source: wiktionary
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We define strict and weak duality involutions on 2-categories, and prove a coherence theorem that every bicategory with a weak duality involution is biequivalent to a 2-category with a strict duality involution.
Source: wiktionary
This is chloride of ammomium, in which 2 atoms of hydrogen are displaced by the biequivalent atom of mercury.
Source: wiktionary
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