general
How to write an algorithm as an equation?
Alright, it's with trepidation that I ask this, because dear god do I feel stupid. A question asked: Whenever we run this formula we double x, then s...
Apr 21, 2026
Archive: General
general
Find h in terms of r
A sphere and a cylinder have equal volumes. The sphere has a radius 3r. The cylinder has radius 2r and height h. Find h in terms of r. I'm only 15, s...
Apr 21, 2026
general
If $\operatorname{ran} F \subseteq \operatorname{dom} G$, then $\operatorname{dom}(G \circ F) = \operatorname{dom} F$.
THEOREM: If $ \text{ran } F \subseteq \text{dom } G $ then $\text{dom }(G \circ F)= \text{dom }F$ PROOF: if $ F\subseteq A \times B$ and $ G\subseteq B\ti...
Apr 21, 2026
general
Using the power rule instead of the reciprocal rule?
I'm stuck with this problem: I got to find the derivative of $\frac{1}{x^2+80}$ and I do know how to solve it by using the reciprocal rule, but whene...
Apr 21, 2026
general
Textbook Recommentation: Discrete Differential Geometry
are there any good books that provide a good introduction to Discrete Differential Geometry to beginners? Thanks a lot.
Apr 21, 2026
general
What's the difference between an initial value problem and a boundary value problem?
I don't really see the difference, because in both case we need to determine y and the values of the constants. The only difference is that we give t...
Apr 21, 2026
general
Statistics. How to find the median of two other medians?
I got median of 226 and another median of 304. Now the question is how to find the overall median? Averaging them is not the correct answer.
Apr 21, 2026
general
How to multiply a vector from the left side with matrix?
I have always dealt with vector - matrix multiplication where the vector is the right multiplicand, but I am not sure how to apply the product between a m...
Apr 21, 2026
general
What does "express this equation in terms of $x$" mean (eg, for $x+y=2$)?
So I just had this controversial question on my maths exam and it said "express this equation in terms of $x$." To make it simple, let’s assume ...
Apr 21, 2026
general
User Mark Yasuda - Mathematics Stack Exchange
Q&A for people studying math at any level and professionals in related fields
Apr 21, 2026
