Why is the range of inverse cotangent only positive?
73593
Why is the range of inverse trigonometric functions defined in this way?
150415
Pseudoinverse and norm
149536
Why is the  $L_p$ norm strictly convex for $1<p<\infty?$
106803
How to see $\cos x \leq \exp(-x^2/2)$ on $x \in [0,\pi/2]$?
155426
Difference between negative and positive temperatures written as absolute value or the negative integer?
3038
For positive invertible operators $C\leq T$ on a Hilbert space, does it follow that $T^{-1}\leq C^{-1}$?
23128
Why aren't logarithms defined for negative $x$?
120676
A certain element which makes functionals positive
142779
How to show distance between boundary of an open set and a compact subset is positive?
100731
Positive operator has a positive spectrum?
73807
Prove positive definiteness
14731
Limit with inverse trignometry
155635
Why is the math for negative exponents so?
32611
Is the trace of inverse matrix convex?
112314
On The Range Of The Tangent
118903
The sup norm on $C[0,1]$ is not equivalent to another one, induced by some inner product
98002
Let $x$ be a positive real number. Inequality problem with $\pi$ and $x$ terms.