Subring And Subfield (part - 1)

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Subring And Subfield
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2 belongs to 2Z+. & 3 belongs to 3Z+. But 2+3=5 doesn't belongs to 2Z+. Or 3Z+. So 2ZU3Z is not close w.r.t. +
So 2ZU3Z doesn't form a subring of Z+.

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