Is there a cubic polynomial $f(x)$ with real coefficients such that $f$ is monotonic and $f(x)=f^{-1}(x)$ has more than $3$ real roots?

Relation between adding the areas of two circles and Pythagorean Theorem

Jointly Gaussian random vectors

Finding angle $x$, a geometry question

Can any subset of $\mathbb{R}$ be generated from open intervals?

Factoring $x^4-2x^3+2x^2+x+4$

Sum of squares of products of subsets without neighboring elements equals $(N+1)! -1$

Absolute convergence to a rational number

Text book Possible Error

solve:$\int \frac{e^x+1}{e^x-1}dx$

Is it in general true that a space is not homeomorphic to the punctured version of this space?

Cauchy's formula for repeated integrals proof by induction

When are two neighbouring fractions in Farey sequence are similarly ordered

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