I have been exploring an algebraic structure with a map (_)* such that(adsbygoogle = window.adsbygoogle || []).push({});

(x)*** = (x)*

but in general it is not an involution. Also, the set of elements e such that

e** = e

do not form a substructure because they are not closed to addition.

Has anyone seen such maps before, or know/can suggest a name?

Thank you!

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# Does anyone know the name of this type of map

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