cele

# 99 Questions

3
11
votes
3
answers
20k
views

1
8
votes
1
answer
2k
views

6
votes
1
answer
1k
views

4
6
votes
1
answer
9k
views

1
6
votes
2
answers
331
views

3
5
votes
2
answers
757
views

2
4
votes
3
answers
1k
views

4
votes
1
answer
311
views

2
4
votes
2
answers
1k
views

1
4
votes
2
answers
4k
views

3
4
votes
3
answers
388
views

4
votes
1
answer
1k
views

3
votes
2
answers
986
views

3
votes
2
answers
1k
views

4
3
votes
2
answers
7k
views

1
3
votes
1
answer
713
views

3
votes
1
answer
2k
views

3
votes
0
answers
119
views

### Let $R$ be a ring with identity. Prove that if $1-ab$ is invertible for some $a,b \in R$, then $1-ba$ is also invertible. [duplicate]

Apr 22 '15 at 18:30 marwalix 13.4k
2
3
votes
2
answers
127
views

2
3
votes
3
answers
287
views

1
3
votes
3
answers
2k
views

1
3
votes
4
answers
193
views

1
3
votes
4
answers
196
views

2
3
votes
0
answers
387
views

### Let $A\subseteq\Bbb R$ with $\lambda^*(A)>0$. Show that there exists a nonmeasurable $B\subseteq\Bbb R$ s.t. $B\subseteq A$

Dec 9 '13 at 1:46 aschepler 1,552

2
votes
2
answers
396
views

3
2
votes
1
answer
200
views

2
2
votes
3
answers
757
views

1
2
votes
4
answers
638
views

2
votes
1
answer
2k
views

2
votes
3
answers
229
views