User sma

189 votes

9 answers

15k views

"Advice to young mathematicians"

Dal

7,716

asked Nov 27, 2014 at 22:04

121 votes

6 answers

61k views

lim sup and lim inf of sequence of sets.

elementary-set-theory limsup-and-liminf

Comic Book Guy

5,398

asked Feb 10, 2012 at 21:50

54 votes

2 answers

29k views

Why is $L^{\infty}$ not separable?

real-analysis functional-analysis normed-spaces lp-spaces separable-spaces

Andylang

1,563

asked Jan 9, 2012 at 16:08

42 votes

4 answers

9k views

Free throw interview question

probability expected-value

sedavidw

600

asked Jul 17, 2014 at 11:00

29 votes

3 answers

11k views

How does the quotient $\mathbb{R}/\mathbb{Z}$ become the circle $S^1$?

general-topology quotient-spaces

Sharabh

316

asked Sep 17, 2013 at 0:42

23 votes

3 answers

16k views

What does "test function" mean?

real-analysis functional-analysis sobolev-spaces distribution-theory

Phani Raj

2,240

asked Feb 14, 2013 at 19:06

14 votes

2 answers

2k views

Simple proof that Fourier transform is an isomorphism between $L^p$ spaces for $p \neq 2$?

functional-analysis fourier-analysis fourier-transform harmonic-analysis vector-space-isomorphism

el_tenedor

3,392

asked Aug 28, 2017 at 9:30

11 votes

1 answer

14k views

How to set up Lagrangian optimization with matrix constrains

optimization convex-optimization lagrange-multiplier

Boby

5,451

asked Jan 14, 2015 at 18:35

7 votes

2 answers

2k views

When can we use derivative test to identify injective function?

calculus functions derivatives monotone-functions

Umesh shankar

9,853

asked Feb 27, 2019 at 17:47

5 votes

1 answer

231 views

Puzzle on the proof of that test function space is not metrizable

functional-analysis

stephenkk

895

asked Mar 20, 2018 at 7:32

4 votes

1 answer

734 views

Deriving Bayesian logistic regression

probability statistics regression

littleO

48.6k

asked Dec 29, 2018 at 12:11

3 votes

2 answers

2k views

Uniqueness of the Jordan decomposition

linear-algebra matrices matrix-decomposition jordan-normal-form

Dorothy Kimmel

115

asked Mar 21, 2013 at 6:50

3 votes

1 answer

630 views

$L^p(\mathbb{R})$ separable.

real-analysis integration analysis lp-spaces separable-spaces

Anthony Peter

6,363

asked Oct 29, 2015 at 6:52

2 votes

1 answer

565 views

Analytic function given by improper integral

complex-analysis improper-integrals riemann-zeta holomorphic-functions

Bryan Shih

9,042

asked Jul 4, 2017 at 8:36

1 vote

2 answers

338 views

Find the jordan basis for $A$

linear-algebra eigenvalues-eigenvectors jordan-normal-form

K Split X

6,415

asked Nov 28, 2017 at 22:35

1 vote

1 answer

346 views

Can essentially bounded function take infinite value on measure zero set?

real-analysis analysis functional-analysis

baagii

11

asked Sep 5, 2014 at 4:59

1 vote

2 answers

7k views

How to find residue of a function

complex-analysis residue-calculus

mSourav

183

asked May 16, 2018 at 3:56

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17 Bookmarks

"Advice to young mathematicians"

lim sup and lim inf of sequence of sets.

Why is $L^{\infty}$ not separable?

Free throw interview question

How does the quotient $\mathbb{R}/\mathbb{Z}$ become the circle $S^1$?

What does "test function" mean?

Simple proof that Fourier transform is an isomorphism between $L^p$ spaces for $p \neq 2$?

How to set up Lagrangian optimization with matrix constrains

When can we use derivative test to identify injective function?

Puzzle on the proof of that test function space is not metrizable

Deriving Bayesian logistic regression

Uniqueness of the Jordan decomposition

$L^p(\mathbb{R})$ separable.

Analytic function given by improper integral

Find the jordan basis for $A$

Can essentially bounded function take infinite value on measure zero set?

How to find residue of a function