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    sawsan's Avatar
    sawsan Posts: 1, Reputation: 1
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    #1

    Mar 14, 2008, 06:08 AM
    abstract algebra
    show that the set R of all multiples of 3 is a subring of Z .
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Mar 14, 2008, 10:42 AM
    Here's a start. There must be closure under additon and multiplication.

    The set 3Z of all multiples of 3 is a subring.

    Take ; let a=3x and b=3y.

    Then

    and
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