User Uria Mor

6 votes

1 answer

505 views

For what values of t, the solution for this equation exist

asked Apr 10, 2015 at 10:22

5 votes

2 answers

171 views

Show that if $ |f( \frac{1}{n}) | \leq \frac{1}{n!}$ then $0$ is an essential singularity

asked May 14, 2016 at 12:36

4 votes

2 answers

945 views

Heat equation "like" problem: solve $u_{tt} -u_{xx} -u_t -u_x = 0$ using differential operator

asked Apr 14, 2018 at 11:50

4 votes

1 answer

519 views

Spectrum of sum of standard operator

asked Feb 27, 2017 at 10:16

4 votes

2 answers

64 views

Improper multiple integals involving inner porduct

asked Feb 23, 2016 at 15:34

4 votes

1 answer

176 views

VERIFICATION: Prove that $\int_{-\infty}^{\infty}\frac{1-b+x^{2}}{\left(1-b+x^{2}\right)^{2}+4bx^{2}}dx=\pi$ for $0<b<1$

asked May 3, 2016 at 14:44

3 votes

1 answer

249 views

Evaluate $\int_{ - \infty}^{\infty} \frac{dx}{1+x^2}$ using complex integration

asked May 5, 2016 at 7:38

3 votes

0 answers

53 views

Well posedness of PDEs of the form $u_{tt} + \left[ P ( \partial_x)\right]^2u=0$

asked May 19, 2018 at 18:19

2 votes

1 answer

163 views

Three closed sets in $T_4$ space which have an empty intersection.

asked Dec 6, 2016 at 12:36

2 votes

2 answers

150 views

Ex 2.5 in Rotman's introduction to group theory

asked Sep 21, 2016 at 17:17

2 votes

1 answer

480 views

Minimal orthogonal projections, and distances in Hilbert spaces.

asked Feb 27, 2017 at 11:58

2 votes

0 answers

55 views

No open subset $U \subset \mathbb{C}$ so that $f|_U :U \rightarrow \mathbb{C} \smallsetminus {0}$ where $f=e^z$ is a bijection

asked Mar 30, 2016 at 12:28

2 votes

1 answer

466 views

A $\mathcal{C}^1$ function $f: \mathbb{R} \rightarrow \mathbb{R} $ preserve Jordan measurability

asked Jan 9, 2016 at 9:37

2 votes

0 answers

50 views

How to find derivative of $\left\Vert x-a\right\Vert ^{p}:\mathbb{R}^{n}\rightarrow\mathbb{R}$?

asked Jul 18, 2015 at 10:03

2 votes

0 answers

59 views

Preparations to finals, validation needed

asked Jul 1, 2015 at 11:42

2 votes

1 answer

2k views

f continuously differentiable implies f is Lipschitz on compact subsets

asked Apr 17, 2015 at 16:33

2 votes

0 answers

101 views

Need help in understanding the question. Elemntary number theory

asked May 19, 2015 at 7:53

2 votes

0 answers

108 views

Need a hint with permutations and pigeonhole-principle question

asked Dec 9, 2014 at 10:09

1 vote

1 answer

277 views

Multinomial identity - guidance needed

asked Dec 9, 2014 at 15:09

1 vote

1 answer

186 views

Finitely generated abelian groups isomorphism

asked Dec 31, 2014 at 14:10

1 vote

1 answer

541 views

How many solutions for the equation $x_1 + x_2 + x_3 = n $ for positive integers when...

asked Feb 8, 2015 at 17:21

1 vote

1 answer

266 views

Group homomorphism between integers and real

asked Nov 9, 2014 at 12:23

1 vote

2 answers

187 views

Cyclic finite groups and their direct product

asked Nov 23, 2014 at 17:07

1 vote

2 answers

116 views

Guidance and sanity check needed - question on the isomorphism theorems

asked Nov 25, 2014 at 18:56

1 vote

2 answers

245 views

Legendre symbol, a theoretical question.

asked May 24, 2015 at 16:55

1 vote

1 answer

58 views

How to solve a non-linear ODE

asked May 5, 2015 at 12:25

1 vote

1 answer

177 views

Bounds of ordinary differential equation

asked May 5, 2015 at 16:21

1 vote

1 answer

272 views

ODE, Picard approximation of a second order equation: How do I make sure that this is correct.

asked Jul 4, 2015 at 16:04

1 vote

3 answers

77 views

ODE, a first order none-linear equation with ratios and exponents

asked Aug 15, 2015 at 7:27

1 vote

1 answer

197 views

Runs of white balls in sampling without replacement

asked Aug 1, 2015 at 9:37

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56 Questions

For what values of t, the solution for this equation exist

Show that if $ |f( \frac{1}{n}) | \leq \frac{1}{n!}$ then $0$ is an essential singularity

Heat equation "like" problem: solve $u_{tt} -u_{xx} -u_t -u_x = 0$ using differential operator

Spectrum of sum of standard operator

Improper multiple integals involving inner porduct

VERIFICATION: Prove that $\int_{-\infty}^{\infty}\frac{1-b+x^{2}}{\left(1-b+x^{2}\right)^{2}+4bx^{2}}dx=\pi$ for $0<b<1$

Evaluate $\int_{ - \infty}^{\infty} \frac{dx}{1+x^2}$ using complex integration

Well posedness of PDEs of the form $u_{tt} + \left[ P ( \partial_x)\right]^2u=0$

Three closed sets in $T_4$ space which have an empty intersection.

Ex 2.5 in Rotman's introduction to group theory

Minimal orthogonal projections, and distances in Hilbert spaces.

No open subset $U \subset \mathbb{C}$ so that $f|_U :U \rightarrow \mathbb{C} \smallsetminus {0}$ where $f=e^z$ is a bijection

A $\mathcal{C}^1$ function $f: \mathbb{R} \rightarrow \mathbb{R} $ preserve Jordan measurability

How to find derivative of $\left\Vert x-a\right\Vert ^{p}:\mathbb{R}^{n}\rightarrow\mathbb{R}$?

Preparations to finals, validation needed

f continuously differentiable implies f is Lipschitz on compact subsets

Need help in understanding the question. Elemntary number theory

Need a hint with permutations and pigeonhole-principle question

Multinomial identity - guidance needed

Finitely generated abelian groups isomorphism

How many solutions for the equation $x_1 + x_2 + x_3 = n $ for positive integers when...

Group homomorphism between integers and real

Cyclic finite groups and their direct product

Guidance and sanity check needed - question on the isomorphism theorems

Legendre symbol, a theoretical question.

How to solve a non-linear ODE

Bounds of ordinary differential equation

ODE, Picard approximation of a second order equation: How do I make sure that this is correct.

ODE, a first order none-linear equation with ratios and exponents

Runs of white balls in sampling without replacement