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Q&A Meta

Posts by r~~‭

48 posts
Score Age
85%
+10 −0
Q&A Third kind of infinite

posted 3y ago by r~~‭  ·  edited 3y ago by r~~‭

Answer
81%
+7 −0
Q&A Why should a non-commutative operation even be called "multiplication"?

posted 4y ago by r~~‭

Answer
81%
+7 −0
Q&A What is the formula for sample standard deviation of a small sample size?

posted 1y ago by r~~‭  ·  edited 1y ago by r~~‭

Answer
80%
+6 −0
Meta Questions with a quote/screenshot and a request to explain

posted 3y ago by r~~‭

Answer
80%
+6 −0
Q&A What is the probability that the convex hull of $n$ randomly distributed points has $l$ of the points on its boundary?

posted 2y ago by r~~‭

Answer
78%
+9 −1
Q&A Complex numbers in 2D, quaternions in 4D, why nothing in 3D?

posted 2y ago by r~~‭  ·  edited 2y ago by r~~‭

Answer
77%
+5 −0
Q&A Strange behavior in elections and pie charts

posted 1y ago by r~~‭  ·  edited 1y ago by r~~‭

Answer
77%
+5 −0
Q&A The meaning of $\pm$

posted 1y ago by r~~‭

Answer
77%
+5 −0
Q&A Why always rationalize a denominator?

posted 4y ago by r~~‭  ·  edited 4y ago by r~~‭

Answer
75%
+4 −0
Q&A Minimal non-standard number in non-standard models of PA

posted 9mo ago by r~~‭

Answer
75%
+4 −0
Q&A Getting backward of partial differentiation's chain rule

posted 3y ago by r~~‭

Answer
75%
+4 −0
Q&A Generalization of categorical product

1 answer  ·  posted 2y ago by r~~‭  ·  last activity 2y ago by Derek Elkins‭

Question category-theory
75%
+4 −0
Q&A Example of $f:[0,1]\to\mathbf{R}$ with $\lim_{a\to 0^+}\int_a^1f(x)dx=L $ for some real number $L$ but $\int_0^1|f(x)|dx=\infty $

posted 2y ago by r~~‭

Answer
75%
+4 −0
Q&A Why can't we conclude the extrema property of a function from its quadratic approximation when the discriminant is zero?

posted 2y ago by r~~‭

Answer
71%
+3 −0
Q&A Show that $f(x) = \arctan\left(\frac{x}{x+1}\right) + \arctan\left(\frac{x+1}{x}\right) = \frac{\pi}{2}$

posted 2y ago by r~~‭

Answer
71%
+3 −0
Q&A Is there a closed formula for multiplication of imaginary units in the direct limit of the Cayley-Dickson construction?

posted 4mo ago by r~~‭  ·  edited 3mo ago by r~~‭

Answer
71%
+3 −0
Q&A If $\mathbf{R}$ is thought of as a vector space over $\mathbf{Q}$, what is its dimension?

posted 2y ago by r~~‭  ·  edited 2y ago by r~~‭

Answer
71%
+3 −0
Q&A What does upper indices represent?

posted 3y ago by r~~‭  ·  edited 3y ago by r~~‭

Answer
71%
+3 −0
Q&A transpose matrix and general matrix is completely messed up

posted 3y ago by r~~‭  ·  edited 3y ago by r~~‭

Answer
71%
+3 −0
Q&A Is Pythagorean theorem really valid in higher dimensional space?

posted 3y ago by r~~‭  ·  edited 3y ago by r~~‭

Answer
71%
+3 −0
Q&A Given a triangle with squares on two sides, the line segments joining the centres of the squares to the midpoint of the third side are equal and perpendicular

posted 4y ago by r~~‭

Answer
71%
+3 −0
Q&A Product of empty set of elements vs. product over empty indexing set — is there any difference?

posted 4y ago by r~~‭

Answer
66%
+2 −0
Q&A organizing a library

posted 2y ago by r~~‭  ·  edited 2y ago by r~~‭

Answer
66%
+2 −0
Q&A How can I visualize this Compound Interest Chart with indefinite integrals?

posted 4y ago by r~~‭

Answer
66%
+2 −0
Q&A Cyclical or “loop” fractals?

posted 9mo ago by r~~‭

Answer