Kasper
Reputation
4,021
Next privilege 5,000 Rep.
Approve tag wiki edits
3 28 49
Impact
~115k people reached

# 198 Questions

3
1
80
views

9
3
1k
views

17
57
1
3k
views

3
0
90
views

### No rigorous proofs from 200 B.C to 1870?

jan 24 at 23:22 Kasper 4,021
1
5
1
101
views

3
5
7k
views

0
4
836
views

3
1
93
views

0
2
32
views

29
47
8
3k
views

3
5
389
views

1
7
0
203
views

### Direct proof that $\sqrt{2}$ is irrational? [duplicate]

nov 11 at 13:25 robjohn 153k
44
83
16
10k
views

4
0
31
views

### Let $A''=\operatorname{End}_{A'}(V)=\operatorname{End}_{\operatorname{End}_A(V)}(V)$. Show that $A''$ is a $k$-algebra.

oct 17 at 14:55 Kasper 4,021

0
2
26
views

2
1
20
views

1
3
2
39
views

3
4
95
views

1
vote
0
40
views

### Using upshape (non-italic) variables in mathematics

oct 9 at 11:54 Kasper 4,021
8
15
8
15k
views

1
11
1
233
views

1
3
1
260
views

1
vote
1
116
views

1
vote
1
55
views

2
0
47
views

### Let $V=V_{1}⊕ ⋯ ⊕ V_{n}$ be semisimple. $U$ irreducible. Show that $\dim_{k} (Hom_A(U,V))$ is equal to the number of $V_i$ equivalent to $U$.

oct 5 at 10:02 Kasper 4,021

0
1
38
views

2
0
64
views

### Remark 3.1.3 from Introduction to Representation Theory from Pavel Etingof

oct 3 at 11:42 Kasper 4,021
3
8
4
380
views

0
1
31
views

0