# All Questions

126,250 questions
Filter by
Sorted by
Tagged with
0answers
18 views

### The number of elements in {1,2,…,a}.{1,2,…,b}, where $ab=n^2$

Let $A_{a,b}$=$\{mn:m\leq a,n\leq b\}$, where $ab=n^2$ are two fixed integers. How large is $A_{a,b}$? Must $A_{a,b}$ no less then $[1,2,...,n].[1,2,...,n]$ for all $a,b$ such that $ab=n^2$?
0answers
4 views

0answers
34 views

### Stronger form of countable dense homogeneity

I am completing my undergrad thesis about topological properties of some subspaces of the real numbers, and CDH spaces are one of the topics I´ve covered (I know almost nothing about it, I only prove ...
0answers
41 views

### Folding Polygons into 'Vessels'

This question is based on http://www.science.smith.edu/~jorourke/Papers/FoldingPP.pdf Define an vessel as a convex polyhedron with one face removed - in other words, a vessel can be converted into a ...
0answers
38 views

0answers
79 views

### Measurable selection proof of conditional expectation as Borel function

It is well know that if $X,Y\in L^2(\Omega,\mathcal{F},\mathbb{P})$, for some probability space $(\Omega,\mathcal{F},\mathbb{P})$, then there exists a Borel function \$h:\mathbb{R}\rightarrow \mathbb{R}...

15 30 50 per page