How to name these "ideals"?

The existence of complete Riemannian metric

Translation of a German paper

How do I determine if the following function is periodic?

How can I show a supremum of a set is also its limit point?

Is it possible to write a sum as an integral to solve it?

Show that $\sum\limits_{k=1}^\infty \frac{1}{k(k+1)(k+2)\cdots (k+p)}=\frac{1}{p!p} $ for every positive integer $p$

Inverse of an invertible upper triangular matrix of order 3

Vladimir Zorich vs Rudin/Pugh/Abbott

How many relations are there between the set A and B?

Minimum of $\sqrt{\frac{a}{b+c}}+\sqrt{\frac{b}{c+a}}+\sqrt{\frac{c}{a+b}}$

Finding $\int\limits_1^\infty \frac{\sin^4(\log x)}{x^2 \log x} \mathrm{d}x$

How prove this $x^3+y^3+z^3+3\ge 2(x^2+y^2+z^2)$

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