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New posts in problem-solving
A curious case of $1729$
number-theory
elementary-number-theory
recreational-mathematics
problem-solving
puzzle
Arc sums for a circle of $k$ positive integers whose total sum is $n$
combinatorics
recreational-mathematics
problem-solving
pigeonhole-principle
About the distribution of $\{k(\sqrt{2}-1)\mid k\in \mathbb{N}\}$
summation
contest-math
problem-solving
ceiling-and-floor-functions
Is my method of solving equation correct?
algebra-precalculus
problem-solving
radicals
Simplifying $\sqrt{\underbrace{11\dots1}_{2n\ 1's}-\underbrace{22\dots2}_{n\ 2's}}$
combinatorics
number-theory
problem-solving
factoring
Solving for $x$: $1=\frac{1}{x}+\frac{1}{1+\frac{1}{x}}+\frac{1}{1+\frac{1}{1+\frac{1}{x}}}+\cdots$
sequences-and-series
problem-solving
infinity
continued-fractions
How can I solve this problem without having to do it by hand?
discrete-mathematics
prime-numbers
problem-solving
computational-mathematics
open-problem
Find the value of $3^9\cdot 3^3\cdot 3\cdot 3^{1/3}\cdot\cdots$
recreational-mathematics
problem-solving
infinite-product
Anecdote about mathematicians leaping to tops of problems and then building a staircase down?
reference-request
soft-question
education
problem-solving
Where is the lost dollar? [duplicate]
problem-solving
Literature on Mathematical Problem Posing
reference-request
recreational-mathematics
problem-solving
How to prove this innocent inequality?
inequality
problem-solving
Missing dollar problem [duplicate]
arithmetic
puzzle
problem-solving
Find all polynomials that fix $\mathbb Q$ and the irrationals [duplicate]
polynomials
problem-solving
rational number solutions to $\frac{a}{a^2+1} + \frac{b}{b^2+1} = \frac{c}{c^2+1}$ with $abc\ne 0$
diophantine-equations
problem-solving
elliptic-curves
rational-functions
rationality-testing
Smallest multiple whose digits are only ones and zeros [duplicate]
elementary-number-theory
recreational-mathematics
problem-solving
If $x+y+z=xyz$, prove $\frac{2x}{1-x^2}+\frac{2y}{1-y^2}+\frac{2z}{1-z^2}=\frac{2x}{1-x^2}\times\frac{2y}{1-y^2}\times\frac{2z}{1-z^2}$ [duplicate]
algebra-precalculus
trigonometry
summation
problem-solving
alternative-proof
Solution of the differential equation $\,f(x)f'(x)+f'(x) = g(x)$? [closed]
integration
ordinary-differential-equations
derivatives
problem-solving
How many $N$ of the form $2^n$ are there such that no digit is a power of $2$? [duplicate]
combinatorics
number-theory
contest-math
problem-solving
What should I try to learn from Polya's "How to Solve It"?
calculus
algebra-precalculus
reference-request
soft-question
problem-solving
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