Is this a scalar product of three vectors?

Has $n^{n+1}+(n+1)^{n+2}$ other obvious factors than that I found?

Can I get a sequence of bounded functions converging pointwise to $f(x)=1/x$ for $x$ non zero and $0$ for $x$ zero?

countable family of open sets

Unclear ideas in the proof of the Archimedean Principle

Given $a,b,c$ positive numbers, is there a function $h$ such that $h(ax+b) = c \cdot h(x)$ for all $x>0$?

How do we know $\sin$ and $\cos$ are the only solutions to $y'' = -y$?

What do mathematicians mean when they say some conjecture can’t be proven using the current technology?

Why do mean value theorems have open interval for differentiablity while closed for continuity?

Sort of positive matrix

(algebraic topology) question about the cellular approximation theorem

Covering a set with $N$ balls of common minimal(!) radius (Existence of such a covering)

Is it possible to solve this second order autonomous differential equation?

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