User Riccardo.Alestra

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0 answers

131 views

Given the following nonlinear PDE: $\partial_{tt} u(x,t)=ku(x,t)\partial_{xx}u(x,t)$, with $u(0,t)=u(L,t)=0$, is it possible to solve it analytically? [closed]

asked Apr 3, 2012 at 11:26

5 votes

1 answer

210 views

Evaluation of the definite integral $\int_0^{\pi/2}x\tan(x)^pdx$ [closed]

asked Jul 29, 2014 at 10:46

0 votes

1 answer

128 views

A question about Mertens function $M(n)=\sum_{k=1}^n\mu(n)$

asked Jan 15, 2018 at 14:24

3 votes

2 answers

554 views

Series expansion of $\int x^xdx$

asked Jun 9, 2016 at 8:48

3 votes

3 answers

527 views

Fractional differential equation

asked Feb 20, 2012 at 19:33

0 votes

1 answer

158 views

Finite number of consecutive prime numbers

asked Nov 17, 2022 at 12:26

0 votes

1 answer

371 views

Logistic function approximation of the real valued Riemann $\zeta(x)$ function

asked Jul 4, 2014 at 6:55

7 votes

2 answers

1k views

Integral of a function defined in the set of Surreal Numbers

asked Feb 23, 2012 at 15:50

3 votes

1 answer

146 views

Calabi flow and Robinson - Trautman equation

asked Mar 7, 2012 at 12:48

5 votes

4 answers

516 views

Closed form solutions of $\ddot x(t)-x(t)^n=0$

asked Jul 5, 2012 at 11:33

0 votes

1 answer

1k views

Trigonometric function of a random variable

asked Mar 2, 2012 at 14:28

0 votes

0 answers

33 views

Tentative formula for the derivative of the logarithm of a series

asked Dec 11, 2021 at 11:59

0 votes

1 answer

51 views

Nonlinear first order differential equation general solution

asked Nov 25, 2021 at 7:06

1 vote

1 answer

173 views

Permutations of a square matrix elements and determinant

asked Sep 13, 2021 at 14:05

0 votes

1 answer

140 views

Matrix functional equation $ f \left( H ^ 2 \right) = \alpha f ( H ) $

asked Jun 28, 2012 at 11:54

4 votes

1 answer

836 views

Second order SDE solutions

asked Apr 19, 2021 at 10:08

1 vote

2 answers

1k views

Square root of a probability

asked Jun 11, 2019 at 9:34

1 vote

1 answer

229 views

Proof of a formula containing double factorial

asked Jun 10, 2016 at 16:19

6 votes

1 answer

3k views

Is the Mellin transform useful to solve differential equations?

asked Jul 6, 2012 at 10:40

0 votes

0 answers

34 views

Solution of a trigonometric inequality involving powers

asked Jan 22, 2021 at 14:05

2 votes

1 answer

73 views

Equation of a trajectory of a point with a constrain on line of sight

asked Jan 30, 2020 at 13:29

0 votes

0 answers

54 views

Harmonic oscillator with random forcing term

asked Jan 11, 2021 at 14:16

0 votes

2 answers

116 views

Osculating circle given parametric coordinates in polar form

asked Dec 18, 2020 at 15:33

1 vote

1 answer

80 views

About Samuelson inequality

asked Sep 2, 2020 at 16:21

32 votes

2 answers

2k views

Can every curve on a Riemannian manifold be interpreted as a geodesic of a given metric?

asked Feb 17, 2012 at 19:55

4 votes

4 answers

2k views

Complex numbers and Nonstandard Analysis

asked Mar 8, 2012 at 12:54

5 votes

2 answers

732 views

Heat equation with an unknown diffusion coefficient

asked Sep 6, 2012 at 8:05

0 votes

0 answers

20 views

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-1 votes

2 answers

89 views

Weird integrals calculation [closed]

asked Nov 11, 2019 at 18:22

3 votes

1 answer

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Approximating function of the integral $\dfrac{\sin(x)^k}{x^k}$

asked Oct 29, 2019 at 14:23

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329 Questions

Given the following nonlinear PDE: $\partial_{tt} u(x,t)=ku(x,t)\partial_{xx}u(x,t)$, with $u(0,t)=u(L,t)=0$, is it possible to solve it analytically? [closed]

Evaluation of the definite integral $\int_0^{\pi/2}x\tan(x)^pdx$ [closed]

A question about Mertens function $M(n)=\sum_{k=1}^n\mu(n)$

Series expansion of $\int x^xdx$

Fractional differential equation

Finite number of consecutive prime numbers

Logistic function approximation of the real valued Riemann $\zeta(x)$ function

Integral of a function defined in the set of Surreal Numbers

Calabi flow and Robinson - Trautman equation

Closed form solutions of $\ddot x(t)-x(t)^n=0$

Trigonometric function of a random variable

Tentative formula for the derivative of the logarithm of a series

Nonlinear first order differential equation general solution

Permutations of a square matrix elements and determinant

Matrix functional equation $ f \left( H ^ 2 \right) = \alpha f ( H ) $

Second order SDE solutions

Square root of a probability

Proof of a formula containing double factorial

Is the Mellin transform useful to solve differential equations?

Solution of a trigonometric inequality involving powers

Equation of a trajectory of a point with a constrain on line of sight

Harmonic oscillator with random forcing term

Osculating circle given parametric coordinates in polar form

About Samuelson inequality

Can every curve on a Riemannian manifold be interpreted as a geodesic of a given metric?

Complex numbers and Nonstandard Analysis

Heat equation with an unknown diffusion coefficient

Samples from K probability distribution

Weird integrals calculation [closed]

Approximating function of the integral $\dfrac{\sin(x)^k}{x^k}$