User Jam - Mathematics Stack Exchange

55 votes

Find a simple proof that π is irrational

answered Dec 4, 2023 at 12:03

37 votes

Circular pizza sharing

answered Oct 26, 2017 at 1:42

35 votes

The Typewriter Sequence

answered Jan 23, 2020 at 14:32

23 votes

Between any two powers of $5$ there are either two or three powers of $2$

answered Jul 26, 2018 at 16:37

20 votes

Is there any similar math limerick?

answered Jul 27, 2014 at 1:25

19 votes

Graphs for which a calculus student can reasonably compute the arclength

answered Aug 12, 2019 at 21:12

18 votes

Why do we divide or multiply by 2 when converting binary?

answered Oct 27, 2017 at 19:54

17 votes

Accepted

If $f \circ f$ is odd, then is so $f$?

answered Oct 9, 2018 at 18:17

14 votes

Is the derivative function typically "worse" than the original function?

answered Oct 8, 2017 at 0:51

13 votes

What is an example of a sequence which "thins out" and is finite?

answered Nov 13, 2019 at 21:38

12 votes

The difference between ∈ and ⊂

answered Oct 7, 2017 at 18:28

9 votes

List of functions not integrable in elementary terms

answered Feb 14, 2020 at 0:38

8 votes

Accepted

Is there a closed form for the sum of the cubes of the binomial coefficients?

answered Nov 28, 2018 at 18:20

8 votes

Average period of the decimal expansion of reciprocals of prime numbers

answered Oct 26, 2022 at 0:51

7 votes

Approximate inverse of $k=\frac{\log (1-t)}{\log (t)}$

answered Oct 27, 2022 at 9:00

7 votes

Are some indefinite integrals impossible to compute or just don't exist?

answered Aug 3, 2019 at 19:39

6 votes

What are real life applications of Diophantine equations?

answered Jan 19, 2020 at 22:07

6 votes

Accepted

Series of binomial coefficient denominators

answered Aug 30, 2018 at 12:13

6 votes

Prove that ${e\over {\pi}}\lt{1\over {2\gamma}}$ without using a calculator.

answered Oct 14, 2017 at 0:31

6 votes

solutions to the family of integrals $\int\frac{1}{\sqrt[n]{x^n+1}}\,dx$

answered Jan 20, 2020 at 22:29

5 votes

Why can I not integrate $\frac{1}{x^2}$ over $0$?

answered Mar 31, 2020 at 10:41

5 votes

Accepted

How can I find/plot $f(t)$ if I only have $f(t+\Delta t)$ and $f(0)$?

answered Oct 1, 2022 at 19:24

5 votes

Use neighborhood signs to express e, pi, phi

answered Oct 2, 2022 at 13:01

5 votes

Converging trigonometric result

answered Nov 26, 2017 at 15:31

5 votes

Accepted

Indefinite integrals of $x^x$ sin(x)/x and relation to elementary integrals

answered Apr 5, 2018 at 18:23

5 votes

Accepted

Probability that the triangle is acute

answered Oct 29, 2018 at 15:52

5 votes

Partially tiling a square with parallelograms

answered Dec 20, 2018 at 1:39

5 votes

Accepted

Possible to get a closed form expression, or an upper bound, for $ f(n)=\sum_{m=1}^\infty \bigg(\frac{m+n}{3}\bigg)^{m+n}\bigg(\frac{1}{m}\bigg)^m$?

answered Nov 3, 2019 at 11:54

5 votes

Accepted

Complex equations with no complex solutions?

answered Jul 29, 2014 at 23:27

5 votes

Accepted

Simple subtraction that I can't figure out.

answered Aug 11, 2014 at 13:50

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417 Answers

Find a simple proof that π is irrational

Circular pizza sharing

The Typewriter Sequence

Between any two powers of $5$ there are either two or three powers of $2$

Is there any similar math limerick?

Graphs for which a calculus student can reasonably compute the arclength

Why do we divide or multiply by 2 when converting binary?

If $f \circ f$ is odd, then is so $f$?

Is the derivative function typically "worse" than the original function?

What is an example of a sequence which "thins out" and is finite?

The difference between ∈ and ⊂

List of functions not integrable in elementary terms

Is there a closed form for the sum of the cubes of the binomial coefficients?

Average period of the decimal expansion of reciprocals of prime numbers

Approximate inverse of $k=\frac{\log (1-t)}{\log (t)}$

Are some indefinite integrals impossible to compute or just don't exist?

What are real life applications of Diophantine equations?

Series of binomial coefficient denominators

Prove that ${e\over {\pi}}\lt{1\over {2\gamma}}$ without using a calculator.

solutions to the family of integrals $\int\frac{1}{\sqrt[n]{x^n+1}}\,dx$

Why can I not integrate $\frac{1}{x^2}$ over $0$?

How can I find/plot $f(t)$ if I only have $f(t+\Delta t)$ and $f(0)$?

Use neighborhood signs to express e, pi, phi

Converging trigonometric result

Indefinite integrals of $x^x$ sin(x)/x and relation to elementary integrals

Probability that the triangle is acute

Partially tiling a square with parallelograms

Possible to get a closed form expression, or an upper bound, for $ f(n)=\sum_{m=1}^\infty \bigg(\frac{m+n}{3}\bigg)^{m+n}\bigg(\frac{1}{m}\bigg)^m$?

Complex equations with no complex solutions?

Simple subtraction that I can't figure out.