If a triangle is not equilateral, must its orthocenter and circumcenter be distinct?

What does equivalence of categories really tell us?

An elementary proof for a series involving logarithm

Let $f\in L^1(\mathbb R)$ and let $F,G:\mathbb R\to\mathbb R$ be the functions defined by: ...

Nonexistence of a homeomorphism between a open set and the unit ball

Understanding a Bill Thurston popularization of knot complements

Evaluate $\int_{0}^{\frac{\pi}{2}}\frac{x^2}{ \sin x}dx$

Probability of remaining a whole pancake rather than two halves.

Why do we need so many trigonometric definitions?

What are the units in $\mathbb{Q}(\sqrt{2}, \sqrt{3})$?

Can numerical methods be used to prove a root does NOT exist?

Find the number of ways in which 6 persons out of 5 men and 5 women can be seated at a round table such that 2 men are never together.

Equation $x^{\frac{n+1}{n}}=x+1$

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