If a ring has an involution f, then f is an auto-anti-isomorphism; but there can be auto-anti-isomorphic rings without involutions.
Do you know rings without involutions, auto-anti-isomorphic (isomorphic to their opposite)? In that case, what is the minimal example?
ac.commutative-algebrara.rings-and-algebrassemigroups-and-monoidsnoncommutative-algebranoncommutative-rings
José María Grau Ribas
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