User user6043040

7 votes

1 answer

2k views

How to prove the parallel projection of an ellipsoid is an ellipse?

asked Jul 20, 2016 at 9:46

5 votes

1 answer

106 views

How to prove a fomula is real or not?

asked Aug 13, 2016 at 9:08

5 votes

0 answers

131 views

Inequality problems in different cases of $n$ [Difficult]

asked Oct 26, 2016 at 12:29

4 votes

0 answers

138 views

Closed form expression to a nested radical formula [duplicate]

asked Nov 16, 2016 at 1:04

3 votes

2 answers

108 views

Find $\lim\limits_{n\to+\infty}n(1-a_n)$ Where $a_n>0$ satisfies $\cos a_n=a_n^n$ [closed]

asked Sep 30, 2017 at 9:56

2 votes

3 answers

1k views

Sum of reciprocals of odd numbers that add up to 1

asked Apr 12, 2019 at 8:04

2 votes

2 answers

102 views

Prove: at most two circles are needed to be tangent to all the circle sequence

asked Jun 14, 2022 at 0:41

2 votes

2 answers

474 views

What is the range of major axis length of the ellipse?

asked Jan 13, 2017 at 9:22

2 votes

1 answer

774 views

How to solve delayed partial differential equations

asked May 9, 2017 at 10:06

2 votes

0 answers

398 views

Analytic solution to Linear Elliptic Equation with Special Dirichlet boundary conditions

asked Aug 26, 2016 at 10:40

2 votes

1 answer

99 views

Is it possible to construct such a function in analytical form?

asked Jun 13, 2016 at 8:41

1 vote

1 answer

95 views

A problem on inequality and number theory [closed]

asked Oct 8, 2016 at 7:39

1 vote

0 answers

83 views

Determine whether the nonconvex problem has a unique global minimum or not

asked Jan 9, 2017 at 6:17

1 vote

0 answers

52 views

Proof of an integration equality and an infinite series equality derived thereof

asked May 3, 2016 at 10:00

0 votes

2 answers

65 views

Find nontrivial rational solutions to a polynomial system

asked Oct 8, 2016 at 16:50

0 votes

0 answers

58 views

Find all the solutions that make the expression a perfect square

asked Jun 26, 2016 at 1:24

0 votes

1 answer

39 views

How to prove such a hyperbolic sine cosine related equality? [closed]

asked Jul 23, 2016 at 12:07

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17 Questions

How to prove the parallel projection of an ellipsoid is an ellipse?

How to prove a fomula is real or not?

Inequality problems in different cases of $n$ [Difficult]

Closed form expression to a nested radical formula [duplicate]

Find $\lim\limits_{n\to+\infty}n(1-a_n)$ Where $a_n>0$ satisfies $\cos a_n=a_n^n$ [closed]

Sum of reciprocals of odd numbers that add up to 1

Prove: at most two circles are needed to be tangent to all the circle sequence

What is the range of major axis length of the ellipse?

How to solve delayed partial differential equations

Analytic solution to Linear Elliptic Equation with Special Dirichlet boundary conditions

Is it possible to construct such a function in analytical form?

A problem on inequality and number theory [closed]

Determine whether the nonconvex problem has a unique global minimum or not

Proof of an integration equality and an infinite series equality derived thereof

Find nontrivial rational solutions to a polynomial system

Find all the solutions that make the expression a perfect square

How to prove such a hyperbolic sine cosine related equality? [closed]