Problem 4:Ris a ring, which is not commutative. Calculate:(a) (a+b)(a−b).(b)...
















Problem 4


:


R


is a ring, which is not commutative. Calculate:








(a) (


a


+


b


)(


a


−


b


).








(b) (


a


+


b


)


3


.

















Problem 3


: Let














R


=


{m/n





:


m,n


∈


Z


, n


is odd


}




















Show that


R


is a subring of


Q


. Is


R


a field?
























Mar 01, 2023
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