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Math Circler, ex-Googler and Dad. Now at Facebook.

Feb
4
awarded  Nice Answer
Oct
23
comment Counting graphs up to isomorphism
Question 1 is unclear. Are you allowing nodes with a single child? What version of isomorphism do you have in mind? For full binary trees where L and R are distinct, the number is the Catalan number. There's certainly no "compact formula" for question 3.
Oct
3
awarded  Enlightened
Sep
29
awarded  Yearling
Sep
8
answered the simple group PSL(2,q)
Aug
23
answered Are trees spectrally determined?
Jun
25
awarded  Excavator
Jun
25
awarded  Citizen Patrol
Jun
17
awarded  Popular Question
Jun
9
awarded  Nice Answer
Jun
4
awarded  Notable Question
May
21
revised Philosophy behind Yitang Zhang's work on the Twin Primes Conjecture
Trying to fix the first two links to Wikipedia
May
6
answered Useful tricks in experimental mathematics
Apr
15
revised What's the “best” proof of quadratic reciprocity?
(Typo correction)
Feb
17
awarded  Notable Question
Jan
1
revised Which curves cut the Hyperelliptic locus?
edited title
Dec
2
revised Proofs without words
deleted 34 characters in body; added 49 characters in body; deleted 43 characters in body
Sep
29
awarded  Yearling
Jul
27
revised Point sets in Euclidean space with a small number of distinct distances
Fixed exponent of n to 77/141.
Jul
24
awarded  Nice Answer