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13 Questions

Votes Activity Newest Views

46

69

votes

3

answers

45k

views

Continuous mapping on a compact metric space is uniformly continuous

real-analysis general-topology metric-spaces uniform-continuity faq

Jun 25 at 15:52 Hrit Roy 2,386

1

5

votes

1

answer

3k

views

Is there a non-abelian group of order 49?

abstract-algebra finite-groups

Jun 21 '17 at 6:33 jha soma 1

1

5

votes

2

answers

179

views

Proving that $ A^n=0 $ if $UAU^{-1}=cA$?

linear-algebra abstract-algebra

Feb 26 '12 at 21:03 Brett Frankel 9,009

4

votes

1

answer

126

views

If $\mathbb{Z}_a\oplus\mathbb{Z}_b\cong \mathbb{Z}_c\oplus\mathbb{Z}_d$, $a|b$, and $c|d$, then $a=c$ and $b=d$.

abstract-algebra

Feb 26 '12 at 5:45 Brian M. Scott 548k

1

3

votes

1

answer

725

views

How many elements are there in the group of invertible $2\times 2$ matrices over the field of seven elements?

abstract-algebra group-theory

Aug 30 '14 at 20:09 Ross Millikan 349k

3

votes

1

answer

254

views

A is diagonalizable

linear-algebra

Mar 4 '12 at 3:25 Michael Hardy 246k

1

2

votes

4

answers

460

views

How can we show that an abelian group of order <1024 has a set of generators of cardinality <10

abstract-algebra group-theory

Mar 1 '12 at 12:09 Curufin 362

3

1

vote

2

answers

956

views

proof that a continuous additive homomorphism $\mathbb{R}^n\to\mathbb{R}^m$ is $\mathbb{R}$-linear

linear-algebra abstract-algebra

Aug 30 '14 at 13:19 levap 55.3k

1

vote

2

answers

270

views

eigenvector proof

linear-algebra

Mar 19 '12 at 5:48 Paul 17.3k

1

vote

3

answers

123

views

is A/B is cyclic?

abstract-algebra group-theory

Feb 25 '12 at 5:19 Brian M. Scott 548k

1

vote

2

answers

835

views

Help with jordan normal form exercises

linear-algebra

Feb 25 '12 at 3:08 Brett Frankel 9,009

0

votes

2

answers

532

views

proof on a uniformly convergent subsequence

sequences-and-series convergence-divergence

Feb 18 '12 at 7:43 Sid Raval 724

0

votes

1

answer

2k

views

how can we prove that the subset of all invertible matrices is open? [duplicate]

matrices

Feb 18 '12 at 6:35 Community♦ 1

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