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Property 5 (existence of multiplicative ...

Property 5 (existence of multiplicative identity): for every integer awe have `a xx 1 = a = 1 xx a` the integer 1 is called the multiplicative identity for integers.

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Property 5 (existence of multiplicative identity): for every integer awe have a xx1=a=1xx a the integer 1 is called the multiplicative identity for integers.

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