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Apr
24
reviewed Close Proving $\lim_{x\to 0}f(x)=\infty$.
Apr
24
reviewed Close Define $(a_n)_{n\in \mathbb{N}}$ by $a_n:=\prod_{k=2}^n (1-\frac{1}{k^{1+c}})$. Does $\lim_{n\to\infty} a_n=0$ hold?
Apr
24
reviewed Leave Closed How do mathematicians find formulas?
Apr
24
reviewed Approve Find the values of a and b such that the sytem has a unique solution and a two-parameter solution?
Apr
16
reviewed Leave Closed Is $ (A × B) ∪ (C × D) = (A ∪ C) × (B ∪ D)$ true for all sets $A, B, C$ and $D$?
Apr
16
reviewed Leave Open Proof that any unit-speed-reparametrization of a curve preserves orientation and is an inverse of an arc length function based at some $t_0$.
Apr
16
reviewed Leave Open Product of two infinite sequences
Apr
16
reviewed Close How to solve $1 = \sum_{p \text{ prime}} x^{-p-1}$?
Apr
16
reviewed Leave Open Find the marginal densities of X and Y?
Apr
16
comment Find the marginal densities of X and Y?
To prove ^, you can integrate wrt y, this this needs some tricks
Apr
16
reviewed Leave Open Prove $(n,m)R(r,s) \equiv (n>r) \text{ or } (n=r \text{ and } m\geq s)$ is an order relation.
Apr
16
reviewed Close What is the derivative of max and min functions?
Apr
16
reviewed Close Difference : subsequences and substrings
Apr
16
awarded  Revival
Apr
15
awarded  Necromancer
Apr
9
comment Left eigenvector of stochastic matrices with eigenvalue 1
nice, are you at havard?
Apr
9
accepted Left eigenvector of stochastic matrices with eigenvalue 1
Apr
9
comment Left eigenvector of stochastic matrices with eigenvalue 1
I assume that eigenvalue smaller than 1 follows by the fact it is stochastic. Assume it is not, then you can contradict the fact it is not stochastic?.
Apr
8
comment Left eigenvector of stochastic matrices with eigenvalue 1
@thanasissdr i have an irreducible markov chain in mind, hence the comment about the uniqueness of equilibrium distribution.
Apr
1
asked Left eigenvector of stochastic matrices with eigenvalue 1