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- 11 Prove that $\Bbb Z[\sqrt{2}, \sqrt{3}]$ does not equal $\Bbb Z[\sqrt{2} + \sqrt{3}]$.
- 10 Is a real number the limit of a Cauchy sequence, the sequence itself, a shrinking closed interval of rational numbers, or what?
- 10 Prove that if I is a prime ideal of R then I[x] is a prime ideal of R[x]
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