The conjecture that half-isomorphisms of automorphic loops are special

Let QQ and PP be automorphic loops, and let f:QPf:Q\to P be a half-isomorphism, meaning that for all x,yQx,y\in Q,

f(xy)=f(x)f(y)orf(xy)=f(y)f(x).f(x*y)=f(x)*f(y)\quad\text{or}\quad f(x*y)=f(y)*f(x).

Special half-isomorphism conjecture. Every half-isomorphism between automorphic loops is special.

The paper proves this assertion for automorphic loops satisfying an additional identity, including automorphic Moufang loops, and notes that known nontrivial examples of half-isomorphisms between automorphic loops are all special. The conjecture proposes that this holds for all automorphic loops.

Sources & referencesView supporting material

Primary source

Maria de Lourdes Merlini Giuliani and Giliard Souza dos Anjos, “Half-isomorphisms of automorphic loops”, arXiv:2203.06230 (2022).

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