Question

$P^2 = P$ implies that $P$ is the orthogonal projection of $V$ onto some subspace $U$.

score 4.6k · Answer 1 · 2018-06-26 22:25:54

4.6k

Views

$P^2 = P$ implies that $P$ is the orthogonal projection of $V$ onto some subspace $U$.

Published on 26 Jun 2018 - 22:25

score 812 · Answer 2 · 2018-06-28 18:43:46

812

Views

What is the number of antisymmetric relations in a set where the relations of some elements are given?

Published on 28 Jun 2018 - 18:43

score 393 · Answer 3 · 2026-03-24 23:53:51

393

Views

Could this possibly be a new simple proof for Schur's triangularization theorem?

Published on 24 Mar 2026 - 23:53

score 30 · Answer 4 · 2018-06-29 22:44:54

30

Views

Continuous operator $E$

Published on 29 Jun 2018 - 22:44

score 1.2k · Answer 5 · 2018-07-01 15:50:16

In how many ways can a committee of $5$ members be formed from $4$ women and $6$ men such that at least $1$ woman is a member of the committee.

score 265 · Answer 6 · 2018-07-04 18:18:19

265

Views

Kernel of a mapping from a polynomial vector space to $\mathbb{R}^3$

Published on 04 Jul 2018 - 18:18

score 324 · Answer 7 · 2018-07-07 18:38:22

324

Views

prove: if a real number $a=\lim_{n\to \infty} a_n > c > 0$, then eventually $a_n > c$

Published on 07 Jul 2018 - 18:38

score 477 · Answer 8 · 2018-07-09 22:27:39

477

Views

Prove $2\mathbb{Z}$ and $3\mathbb{Z}$ are not isomorphic as rings.

Published on 09 Jul 2018 - 22:27

score 171 · Answer 9 · 2018-07-14 09:47:48

171

Views

If $x+3$ is positive, then which one of the following must be positive?

Published on 14 Jul 2018 - 9:47

score 137 · Answer 10 · 2018-07-14 14:07:23

137

Views

If $(x+1)^2 - 2x>2(x+1) +2$, then $x$ cannot equal which of the following?

Published on 14 Jul 2018 - 14:07

score 2.2k · Answer 11 · 2018-07-15 01:38:26

2.2k

Views

Equivalent metrics generate the same topology

Published on 15 Jul 2018 - 1:38

score 414 · Answer 12 · 2018-07-15 22:29:56

414

Views

What is the probability that a randomly selected 6 folders do not contain any complete manuscript?

Published on 15 Jul 2018 - 22:29

score 592 · Answer 13 · 2018-07-16 13:46:52

592

Views

Proof of the irrationality of $\sqrt{2}$.

Published on 16 Jul 2018 - 13:46

score 3k · Answer 14 · 2018-07-21 03:26:34

3k

Views

If an ordered set A has the least upper bound property, then it has the greatest lower bound property

Published on 21 Jul 2018 - 3:26

score 1.4k · Answer 15 · 2018-07-21 15:19:45

1.4k

Views

$T$ is injective if and only if $ST=I_V$ for some $S\in\mathcal{L}(W,V)$.

Published on 21 Jul 2018 - 15:19

List Question

$P^2 = P$ implies that $P$ is the orthogonal projection of $V$ onto some subspace $U$.

What is the number of antisymmetric relations in a set where the relations of some elements are given?

Could this possibly be a new simple proof for Schur's triangularization theorem?

Continuous operator $E$

In how many ways can a committee of $5$ members be formed from $4$ women and $6$ men such that at least $1$ woman is a member of the committee.

Kernel of a mapping from a polynomial vector space to $\mathbb{R}^3$

prove: if a real number $a=\lim_{n\to \infty} a_n > c > 0$, then eventually $a_n > c$

Prove $2\mathbb{Z}$ and $3\mathbb{Z}$ are not isomorphic as rings.

If $x+3$ is positive, then which one of the following must be positive?

If $(x+1)^2 - 2x>2(x+1) +2$, then $x$ cannot equal which of the following?

Equivalent metrics generate the same topology

What is the probability that a randomly selected 6 folders do not contain any complete manuscript?

Proof of the irrationality of $\sqrt{2}$.

If an ordered set A has the least upper bound property, then it has the greatest lower bound property

$T$ is injective if and only if $ST=I_V$ for some $S\in\mathcal{L}(W,V)$.

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