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Mathematics
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Jhon Doe

Wanna get better at math

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  • Last seen 17 hours ago

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Top Posts (98) All Questions Answers | Votes Newest

6 Counter-example: If $J$ is prime then $f^{-1} (J) $ is prime. $f$ need not be unital. Feb 17 '18
5 Uncountable basis of vector space of infinite sequences in R [duplicate] Feb 12 '17
5 $\mathbb{Q}(\alpha)=\mathbb{Q}(\beta)$ if $\alpha, \beta$ are algebraic over $\mathbb{Q}$ of degree $2$ and $\alpha +\beta$ is a root of a quadratic. Oct 15 '18
4 Proof of Uncountable Basis for $\mathbb{N} \to \mathbb{R}$ over $\mathbb{R}$ Feb 12 '17
4 Subset of totally bounded set is totally bounded. Feb 26 '18
4 If $\alpha,\beta\in C$ are algebraic over $Q$, show that $\alpha+\beta$ is a root of a quadratic polynomial in $Q[x]$ (with conditions). Oct 15 '18
4 Addition of continuous functions over topological spaces is continuous. Apr 16
3 What are the approximate eigenvalues of the right shift operator $R$ on $\ell_\infty$ Mar 18
3 If $ U$ is maximal among non-principal ideals show that $U$ is prime. (Hints?) Mar 3 '18
3 Using Cauchy's Criterion to show non-uniform convergence of series of functions. Oct 27 '17
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