I wrote down all the information I could for this problem but I'm having a very difficult time starting it. Let $D =$ {$(x,y): x^2 + y^2 \le a^2, y\g...

I am trying to follow the proof of the following: Let $A$ be an algebra over an algebraically closed field $k$. Let $V=V_1\oplus \ldots \oplus V_r$, where...

A friend who tutors high school math showed me this equation. I could not solve it. But by trial & error in Python I discovered $\sqrt[5]{5}$ is the a...

Consider the following information about travelers on vacation: $40$% check work email, $30$% use a cell phone, $25$% bring a laptop with them, $23$% both...

It seems to me that, in some derivations on fluid dynamic books I am reading, the identity $$\nabla \cdot (\nabla^2 u) = 0 $$ where $u$ is a vector field,...

A triangle, but I drew lines in the corners going out, and did the same with the mini-shapes formed: I have no idea what to call this thing. For a square,...

I put that the statement was true only when a = 0 and b = 0 but the correct answer was that it only held true for a = 0 OR b = 0. With 'and' I f...

[There's still the strategy to go. A suitably robust argument that establishes what is statistically the best strategy will be accepted.] Here's...

In matrix notation what does it mean X 'X I see it in this academic paper, I can't find it in matrix operation and can't search with google...

Suppose we know that there exists widgets. For any widget $X$, we have that the statements $A(X)$ and $B(X)$. Suppose it's true that for any $X$, $A(...