Let consider the number 4 from "Z[\\sqrt{-3} ]"
"4 = 2*2 = (1+\\sqrt{-3}) *(1 - \\sqrt{-3})"
So 4 is not uniquely factorized in "Z[\\sqrt{-3} ]" .
Hence "Z[\\sqrt{-3} ]" is not a U.F.D (Unique Factorization Domain)
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