User maxmilgram

14 votes

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If 3 numbers of the form $\frac{1}{q^2+1}$ have a mean of $\frac{1}{2}$, will one of them always be $\frac{1}{2}$?

answered Aug 2 at 19:01

12 votes

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How to prove that $2x^3+6x+1=0$ has no integer solution?

answered Sep 29, 2019 at 9:07

7 votes

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Convergence of $a_{n+2}^3+a_{n+2}=a_{n+1}+a_n$

answered Feb 9, 2019 at 20:09

6 votes

Nonlinear differential equation $\left(\frac{dy}{dx}\right)^2-4x\frac{dy}{dx}+4y=0$

answered Nov 11, 2019 at 6:43

6 votes

Is there a Lagrangian that produces these equations? How can I find one if it exists?

answered Dec 21, 2021 at 21:16

5 votes

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Does the set of all finite subsets of positive integers form a group under set intersection?

answered Feb 13, 2019 at 6:01

5 votes

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$\lim _{n \to \infty} \int_{0}^1 f \left(\frac{x}{n}\right) dx =0$ find $f(0) ?$

answered Nov 14, 2018 at 12:04

5 votes

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How to eliminate vector from equation

answered Nov 15, 2018 at 11:48

4 votes

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Monotonicty of the trace on Sobolev spaces.

answered Mar 6, 2019 at 7:27

4 votes

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What causes the extraneous root when intersecting parabola $y^2=4ax$ with circle $x^2+y^2=9a^2/4$?

answered Apr 13, 2019 at 9:56

4 votes

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Prove that when writing up all even numbers in a column, then chaining $2n+1$ from them, we get all natural numbers exactly once.

answered Apr 22, 2019 at 13:07

4 votes

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Equivalent ODE forward integration

answered Jun 3, 2019 at 6:39

4 votes

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two constants of integration in first order ODE

answered Jul 31 at 11:12

4 votes

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How to solve $u_{tt}=\Delta u-(x_1^2+4x_2^2)u$?

answered Nov 24 at 11:13

3 votes

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Show one solution of ODE system is bounded above and below

answered Nov 23 at 7:30

3 votes

Analytical solution to a nonlinear ODE $\dot x = cy(1-xy) - \beta cx$ and $\dot y = xc(1-xy)$

answered Aug 10 at 19:47

3 votes

Lagrange Multipliers Question - some extremum points are missed (not detected) by the method

answered Aug 15 at 9:07

3 votes

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Under what conditions does convergence of DEs imply convergence of solutions?

answered Mar 29, 2022 at 8:34

3 votes

Why is $ \lim_{x \to 0} \frac{x^2}{1-\cos(x)} $ not equal to 0?

answered Mar 29, 2021 at 19:23

3 votes

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If $(2^b-1+c^b)^a = (2^a-1+c^a)^b,$ then is it true that $a=b?$

answered May 2, 2019 at 7:57

3 votes

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Confusion about definition of linear equation re: Lorenz system & algebraic equations

answered Nov 11, 2019 at 6:35

3 votes

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Proving an orthogonal matrix minus the identity matrix is invertible

answered Oct 28, 2019 at 18:51

2 votes

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How can I prove this problem?

answered Oct 30, 2019 at 5:52

2 votes

Proper syntax for summation of logarithms

answered Oct 16, 2019 at 20:06

2 votes

Matrix multiplication of $n$-dimensional matrices

answered Apr 26, 2019 at 17:54

2 votes

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Invertible solution to underdetermined system of equations

answered Apr 14, 2019 at 10:33

2 votes

Diffferential Equations

answered Apr 30, 2019 at 4:57

2 votes

If $f(0) < f(2)$ ,then $f([0,2])$ must be equal to $[f(0),f(2)]$ True/false

answered Apr 1, 2019 at 5:53

2 votes

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Laplace equation solution by separation of variables

answered Apr 3, 2019 at 17:37

2 votes

Is it possible to find the angle of depression/elevation of a 4-equilateral triangle faces and 1 square base pyramid?

answered Nov 14, 2018 at 13:25

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146 Answers

If 3 numbers of the form $\frac{1}{q^2+1}$ have a mean of $\frac{1}{2}$, will one of them always be $\frac{1}{2}$?

How to prove that $2x^3+6x+1=0$ has no integer solution?

Convergence of $a_{n+2}^3+a_{n+2}=a_{n+1}+a_n$

Nonlinear differential equation $\left(\frac{dy}{dx}\right)^2-4x\frac{dy}{dx}+4y=0$

Is there a Lagrangian that produces these equations? How can I find one if it exists?

Does the set of all finite subsets of positive integers form a group under set intersection?

$\lim _{n \to \infty} \int_{0}^1 f \left(\frac{x}{n}\right) dx =0$ find $f(0) ?$

How to eliminate vector from equation

Monotonicty of the trace on Sobolev spaces.

What causes the extraneous root when intersecting parabola $y^2=4ax$ with circle $x^2+y^2=9a^2/4$?

Prove that when writing up all even numbers in a column, then chaining $2n+1$ from them, we get all natural numbers exactly once.

Equivalent ODE forward integration

two constants of integration in first order ODE

How to solve $u_{tt}=\Delta u-(x_1^2+4x_2^2)u$?

Show one solution of ODE system is bounded above and below

Analytical solution to a nonlinear ODE $\dot x = cy(1-xy) - \beta cx$ and $\dot y = xc(1-xy)$

Lagrange Multipliers Question - some extremum points are missed (not detected) by the method

Under what conditions does convergence of DEs imply convergence of solutions?

Why is $ \lim_{x \to 0} \frac{x^2}{1-\cos(x)} $ not equal to 0?

If $(2^b-1+c^b)^a = (2^a-1+c^a)^b,$ then is it true that $a=b?$

Confusion about definition of linear equation re: Lorenz system & algebraic equations

Proving an orthogonal matrix minus the identity matrix is invertible

How can I prove this problem?

Proper syntax for summation of logarithms

Matrix multiplication of $n$-dimensional matrices

Invertible solution to underdetermined system of equations

Diffferential Equations

If $f(0) < f(2)$ ,then $f([0,2])$ must be equal to $[f(0),f(2)]$ True/false

Laplace equation solution by separation of variables

Is it possible to find the angle of depression/elevation of a 4-equilateral triangle faces and 1 square base pyramid?