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[URL="http://alnasiry.net/forums"][IMG]http://alnasiry.net/forums/uploaded/2_iraqiflag.gif[/IMG][/URL]
: (*,A)
(1) *,A) a,b,c A
(a*b)*c=a*(b*c)
(2) (*) (e): a
Aa*e=e*a=a
(3) (*):a*a=a=a*a
(*) a*b=b*a
[URL="http://alnasiry.net/forums"][IMG]http://alnasiry.net/forums/uploaded/2_iraqiflag.gif[/IMG][/URL]
: 1 (0 1 )
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