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visits member for 3 years, 7 months
seen Sep 28 at 13:57

A mediocre professor at a top-notch university making mediocre contributions to this top-notch community


19h
awarded  Explainer
Sep
24
awarded  Autobiographer
Sep
11
awarded  Good Question
Jul
15
revised Finding rational points at rational distance in the plane
deleted 1 character in body
Jul
15
comment Finding rational points at rational distance in the plane
@QiaochuYuan: Take $p$ to be $(1/\pi, \sqrt{1-1/\pi^2})$. Aren't both coordinates transcendental? And isn't $p$ unit distance from the origin?
Jul
15
asked Finding rational points at rational distance in the plane
Jul
2
awarded  Curious
Apr
12
awarded  Popular Question
Feb
16
awarded  Yearling
Feb
6
revised Expected tail and head length of $\rho$ for a finite random function
edited body
Jan
30
accepted Looking for intuition behind coin-flipping pattern expectation
Dec
9
answered Equivalence Classes of a Relation Given as a Set of Ordered Pairs
Oct
20
awarded  Great Question
Sep
9
answered Fields, closed under two operations
Aug
5
comment Expected length of a sequence that contains all words of a given length.
@ByronSchmuland I think that's the same ref leonbloy cited at the end of his answer below.
Aug
5
revised Determine whether the argument is valid or invalid
typesetting cleanup
Aug
5
answered Determine whether the argument is valid or invalid
Aug
4
comment N white and black balls and N boxes Probability
Given $N$ new users posting $N$ new questions which are worded as demands rather than questions, what is the probability they are all homework problems?
Jul
17
awarded  Popular Question
Jun
29
comment Fibonacci sequence - how to prove $a_n=\frac{1}{\sqrt{5}} ((\frac{1+\sqrt{5}}{2})^n-(\frac{1-\sqrt{5}}{2})^n)$ without induction
This is given as a warmup in the free text by Wilf called generatingfunctionology.