User Szmagpie

18 votes

Set, n-Tuple, Vector and Matrix — links and differences

answered Jun 6, 2016 at 1:00

8 votes

How do I prove that an isometry is injective?

answered Apr 24, 2016 at 12:53

5 votes

Quotient of a graph?

answered Jun 3, 2016 at 3:36

3 votes

Accepted

How to denote a set of sequences?

answered Nov 11, 2016 at 14:36

2 votes

Accepted

Equivalence relations on graphs

answered Jun 10, 2016 at 2:01

2 votes

Accepted

My proof that $f[f^{-1}(D)] \subseteq D.$

answered Jun 11, 2016 at 18:19

2 votes

Truth table for $p \implies q$

answered Apr 7, 2016 at 14:37

2 votes

Accepted

Confusion on sets and relations

answered Apr 18, 2016 at 17:07

2 votes

Homotopy equivalence between O-O and $\theta$

answered Apr 20, 2016 at 13:49

2 votes

Accepted

Confuse for the Median, First and Third Quartile

answered Jun 4, 2015 at 15:55

2 votes

Natural Deduction Propositional Logic

answered Jun 5, 2015 at 16:12

2 votes

Accepted

Prove that a sequence is bounded/unbounded

answered Nov 21, 2015 at 21:10

2 votes

Accepted

Some insights in quotient topologies

answered Nov 25, 2015 at 21:31

2 votes

Accepted

2-edge-colouring of $K_n$ not containing monochromatic induced subgraph $K_m$ for certain $m$

answered Mar 14, 2016 at 19:53

1 vote

Accepted

Rigorous definition of a charge

answered Mar 30, 2016 at 12:05

1 vote

Equivalence of two norms; Definition and Theorem from Kress

answered Dec 14, 2015 at 20:29

1 vote

Fundamental group obtained by attaching a n-cell with n ≥ 2

answered Apr 25, 2016 at 22:10

1 vote

Accepted

Find a DFS,BFS spanning tree.

answered Jun 13, 2016 at 12:03

1 vote

Accepted

Prove that for $n\ge 2$, $(n + 1)^n n! < (2n)! < 4^n (n!)^2 .$

answered Oct 11, 2016 at 17:24

1 vote

Why is intersection of all sets with indices from T an empty set?

answered Nov 11, 2016 at 14:16

1 vote

What is the minimum number of edges in this special graph?

answered Dec 19, 2016 at 19:59

1 vote

Why does $\operatorname{var}\sum_{i=1}^n w_ir_i=w^\top\Sigma w$ hold?

answered May 20, 2016 at 22:02

1 vote

Accepted

When does $\max \lim{a, |b|} \leq a + \max \lim {|b|}$?

answered May 22, 2016 at 18:11

1 vote

Finite prime field representation of uniform matroid $U_{2,n}$

answered May 25, 2016 at 23:19

1 vote

Accepted

What does it mean for a set to be open in a Topology?

answered Apr 23, 2016 at 18:15

0 votes

Prove that if A is an infinite set and $|A| =|B|$, then $B$ is an infinite set.

answered Apr 30, 2016 at 19:08

0 votes

Accepted

Characteristic functions proof... $\mu\{x:|x|>r\}\le\tfrac r2\int_{-2/r}^{2/r}(1-\varphi(t))\,dt$

answered May 22, 2016 at 16:22

0 votes

$\bigcup X$ finite implies $\mathcal P(X)$ is finite.

answered May 5, 2016 at 19:24

0 votes

Accepted

Every function that is representable in Robinson arithmetic, $\mathsf{Q}$, is computable

answered May 18, 2016 at 3:12

0 votes

Thoughts on this limit ? $\lim_\limits{x\to 3}\dfrac{\frac{1}{3}-\frac{1}{x}}{x-3}$

answered May 16, 2016 at 14:22

Stack Exchange Network

36 Answers

Set, n-Tuple, Vector and Matrix — links and differences

How do I prove that an isometry is injective?

Quotient of a graph?

How to denote a set of sequences?

Equivalence relations on graphs

My proof that $f[f^{-1}(D)] \subseteq D.$

Truth table for $p \implies q$

Confusion on sets and relations

Homotopy equivalence between O-O and $\theta$

Confuse for the Median, First and Third Quartile

Natural Deduction Propositional Logic

Prove that a sequence is bounded/unbounded

Some insights in quotient topologies

2-edge-colouring of $K_n$ not containing monochromatic induced subgraph $K_m$ for certain $m$

Rigorous definition of a charge

Equivalence of two norms; Definition and Theorem from Kress

Fundamental group obtained by attaching a n-cell with n ≥ 2

Find a DFS,BFS spanning tree.

Prove that for $n\ge 2$, $(n + 1)^n n! < (2n)! < 4^n (n!)^2 .$

Why is intersection of all sets with indices from T an empty set?

What is the minimum number of edges in this special graph?

Why does $\operatorname{var}\sum_{i=1}^n w_ir_i=w^\top\Sigma w$ hold?

When does $\max \lim{a, |b|} \leq a + \max \lim {|b|}$?

Finite prime field representation of uniform matroid $U_{2,n}$

What does it mean for a set to be open in a Topology?

Prove that if A is an infinite set and $|A| =|B|$, then $B$ is an infinite set.

Characteristic functions proof... $\mu\{x:|x|>r\}\le\tfrac r2\int_{-2/r}^{2/r}(1-\varphi(t))\,dt$

$\bigcup X$ finite implies $\mathcal P(X)$ is finite.

Every function that is representable in Robinson arithmetic, $\mathsf{Q}$, is computable

Thoughts on this limit ? $\lim_\limits{x\to 3}\dfrac{\frac{1}{3}-\frac{1}{x}}{x-3}$