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Feb
7
revised Prove/disprove: $\forall f\ \in \mathbb N ^{\mathbb R}. \forall x\in \mathbb R. \exists y\in \mathbb R ((f(x)=f(y))\wedge (x\neq y))$
added 211 characters in body
Feb
7
answered Prove/disprove: $\forall f\ \in \mathbb N ^{\mathbb R}. \forall x\in \mathbb R. \exists y\in \mathbb R ((f(x)=f(y))\wedge (x\neq y))$
Feb
5
revised Prove that 1+1=2
added 5 characters in body
Feb
4
reviewed No Action Needed Multiple Poisson r.v.s - conditional probability given the sum of r.v.s is a specific value
Feb
4
comment The definition of negation
There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.
Feb
3
reviewed Approve When is the quotient ring of a multivariable polynomial ring over a field by a monomial ideal an integral domain?
Feb
2
comment Properties of sup and lim inf.
@Vinith How nice it I've helped. And welcome to Mathstackexchange.
Feb
1
comment Properties of sup and lim inf.
@Vinith I think you should not accept such a quick answer. Unless, of course, you've already checked my tip step by step with pencil and paper. Dealing with 'sup' and 'inf' it is necessary familiarity and a good understanding the definition of supremum and the definition of infimum. This familiarity is achieved with practice various exercises.
Feb
1
revised Properties of sup and lim inf.
added 13 characters in body; edited title
Feb
1
revised Properties of sup and lim inf.
added 137 characters in body
Feb
1
answered Properties of sup and lim inf.
Feb
1
revised $ \sum_{n=1}^{\infty}a_{n} $ diverges but $ \sum_{n=1}^{\infty}\frac{a_{n}}{1+a_{n}^{2}} $ sometimes converges and sometime diverges.
added 7 characters in body
Jan
31
reviewed Approve Compute the Frobenius norm
Jan
31
comment Proof by induction: $(1+x)^n > 1 + nx+nx^2$
@Mufasa Note that if we use approach Taylor (or binomial approximation by Newton) combined with the principle of mathematical induction we get demonstration in which the principle of mathematical induction is superfluous.
Jan
31
revised $ \sum_{n=1}^{\infty}a_{n} $ diverges but $ \sum_{n=1}^{\infty}\frac{a_{n}}{1+a_{n}^{2}} $ sometimes converges and sometime diverges.
deleted 21 characters in body
Jan
31
revised $ \sum_{n=1}^{\infty}a_{n} $ diverges but $ \sum_{n=1}^{\infty}\frac{a_{n}}{1+a_{n}^{2}} $ sometimes converges and sometime diverges.
added 67 characters in body
Jan
31
answered $ \sum_{n=1}^{\infty}a_{n} $ diverges but $ \sum_{n=1}^{\infty}\frac{a_{n}}{1+a_{n}^{2}} $ sometimes converges and sometime diverges.
Jan
24
revised Help with integration of $\frac{f'(x)}{[f(x)]^n}$.
edited title
Jan
23
revised Find this limit: $ \lim_{n \to \infty}{(e^{\frac{1}{n}} - \frac{2}{n})^n}$
edited tags
Jan
23
awarded  Good Answer