The conjecture that half-isomorphisms of automorphic loops are special

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

f(x∗y)=f(x)∗f(y)orf(x∗y)=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.

References

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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