is $\sqrt{x}$ always positive?
1522
Is $\sqrt{64}$ considered $8$? or is it $8,-8$?
82097
If $A \succeq B$, is it true that $B^{-1} \succeq A^{-1}$?
776
Entire function with positive real part is constant (no Picard)
86518
Does $X$ have a lower bound?
108084
Is it always true? $\left|A-B\right| \le \left|A\right| + \left|B\right|$
153272
Basic question about $\sup_{x\neq 0}{} \frac{\|Ax\|}{\|x\|} = \sup_{\|x\| = 1}{\|Ax\|} $, $x \in\mathbb{R}^n$
61472
If $0<x<y$, then prove that $\sqrt{x} <\sqrt{y}$ and $x <\sqrt{xy} <y$
16660
Prove that any positive number has an $n$th root
98002
Let $x$ be a positive real number. Inequality problem with $\pi$ and $x$ terms.
112368
Is there a rule for $\sqrt{a+b}$?
148582
Proof: $\|X\|_2\leq \sqrt{n}\|X\|_\infty$
8061
Why must the base of a logarithm be a positive real number not equal to 1?
28228
Is a prime factor of a number always less than its square root?
102138
Why does $\sqrt{x^2}$ seem to equal $x$ and not $|x|$ when you multiply the exponents?
119429
Why do $x^{x^{x^{\dots}}}=2$ and $x^{x^{x^{\dots}}}=4$ have the same positive root $\sqrt 2$?
82630
How is it, that $\sqrt{x^2}$ is not $ x$, but $|x|$?
17928
How to prove the following expression does not depend on x?