Ivan Shishkin, Birch Grove

Magma unifère

Definition / General algebra /

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Un magma (M,∗)(M,*) est dit unifère s’il existe un élément e∈Me\in M, appelé élément neutre, tel que pour tout x∈Mx\in M:
x∗e=x=e∗x.x*e=x=e*x.

Remarques
  • L’élément neutre est unique.
Exemples

∙\bullet Si (M,∗)=(Z,+)(M,*)=(\Z,+), alors e=0e=0.
∙\bullet Si (M,∗)=(R∗,⋅)(M,* )=(\R^*,\cdot) alors e=1e=1.

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