Birim eleman(e) ;x üçgen e =x ile bulunur yani y yerine e yazılıp x e eşitlenir ordan
2x+2e+xe+2=x
x+2e+xe+2=0 gruplardan
x(1+e)+2(1+e)=0
1+e ler ortak yani
(x+2).(1+e)=0 olur.
x=-2,e=-1dir.
Etkisiz eleman e o da -1 eşittir.
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