general
What is the meaning of this expression?
What's the meaning of cos x >_ U[ 2npi - pi/2 , 2npi + pi/2] And what does U denote?
Apr 14, 2026
Archive: General
general
complex conjugate of trace of matrices
Is $[Tr(AB)]^{*} = Tr(AB)^{\dagger} = Tr(B^{\dagger}A^{\dagger})$? The second equal sign is trivial but the first equal sign is what I am puzzled about. $...
Apr 14, 2026
general
Find the possible dimension of U $ \cap $ W
Given U And W are distinct four dimensional subspaces of a vector space V of dimension 6 . Find the possible dimension of U $ \cap $ W .. Attempt : dim(U ...
Apr 14, 2026
general
Character table of $U_{16}$.
Find the character table of $U_{16}$. Could you give me a hint or a start? Thank you.
Apr 14, 2026
general
Why are logarithms not defined for 0 and negatives?
I can raise $0$ to the power of one, and I would get $0$. Also $-1$ to the power of $3$ would give me $-1$. I think only some logarithms (e.g log to the b...
Apr 14, 2026
general
n-cents stamp (Strong induction)
Imagine that your country's postal system only issues 2 cent and 5 cent stamps. Prove that it possible to pay for postage using only these stamps for...
Apr 14, 2026
![max and min versus sup and inf [closed]](https://news.conceivablytech.com/uploads/max-and-min-versus-sup-and-inf-closed_720.jpg)
general
max and min versus sup and inf [closed]
What is the difference between max, min and sup, inf?
Apr 14, 2026
![What is length of $AD$ in this triangle? [closed]](https://news.conceivablytech.com/uploads/what-is-length-of-ad-in-this-triangle-closed_720.jpg)
general
What is length of $AD$ in this triangle? [closed]
I'm preparing for a test and was not able to solve. Here's the question: From the corner $C$ of the triangle $ABC$ draw $CD$, such that $∠ BCD =...
Apr 14, 2026
general
Laplacian and Hodge Laplacian
I am new to the theory of differential forms, but there is one thing that I don't get at all. Imagine that you are on the sphere $\mathbb{S}^2$, then...
Apr 14, 2026
general
Why is the integral of sec^2(x) from 0 to pi infinity?
Why is it, if you take the integral of sec^2(x) from 0 to pi, my calculator returns "infinity" as the answer, but according to the second fundamental theo...
Apr 14, 2026
