Let the rational number $p/q$ be closest to but not equal to $22/7$ among all rational numbers with denominator $< 100$.

In an ultrametric space, is every open set closed?

Prove that a convergent real sequence always has a smallest or a largest term

Why is belonging not transitive?

Simplification of $\prod\limits_{i=1}^{n}{\sin(it)}$

Equality of limits or counterexample

Numerical phenomenon. Who can explain?

Hard inequality :$\Big(\frac{1}{a^2+b^2}\Big)^2+\Big(\frac{1}{b^2+c^2}\Big)^2+\Big(\frac{1}{c^2+a^2}\Big)^2\geq \frac{3}{4}$

Can you find your location in $\mathbb{Z}$ using least prime factor?

Solve $\tan x =\sec 42^\circ +\sqrt{3}$

Compute $\sum \binom{n}{k} \binom{n+k-1}{k} (-1)^k$

Can derivatives be defined as anti-integrals?

How to prove that a point defined by trigonometric functions involving 4 parameters is inside a certain tetrahedron?

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