Given a line and a point in 3D, how to find the closest point on the line?

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Solving $10x^4-13x^2+4=0$

Is there an example for an undefinable number?

Arithmetic rules for big O notation, little o notation and so on...

Is it possible to formulate category theory without set theory?

Can a product of non-principal ideals be principal, in a local ring?

Why is it that for $n<60$, the simple groups are precisely the cyclic groups $\mathbb{Z}_N$ for prime $n$?

When can I move the limit operand into a function?

Are there infinitely many Pythagorean triples with these constraints?

Determine the smallest disc in which all the eigen values of a given matrix lie

Much less than, what does that mean?

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