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Feb
21
asked Nearest Pythagorean Partners
Feb
15
revised Finding the formula for the number of golf balls in a triangular pyramid with $n$ layers.
Edited incorrect info (n-th layer vs n-layer)
Feb
15
suggested approved edit on Finding the formula for the number of golf balls in a triangular pyramid with $n$ layers.
Feb
14
revised Pythagorean rectilinear polygons
added 2 characters in body
Feb
14
revised Pythagorean rectilinear polygons
added 3 characters in body
Feb
14
revised Pythagorean rectilinear polygons
added 3 characters in body
Feb
14
comment Pythagorean rectilinear polygons
@Henry - yes, all Euclidean distances (including the diagonal distances) need to be integer. Have modified the problem statement to stress this point. Thanks.
Feb
14
revised Pythagorean rectilinear polygons
added 5 characters in body
Feb
14
revised Pythagorean rectilinear polygons
added 17 characters in body
Feb
14
asked Pythagorean rectilinear polygons
Dec
27
comment Why do some authors write dx after integral sign?
I guess - depending on the application - physicists prefer keeping the differential adjacent to the integral sign as it stresses the operator nature of integration.
Dec
27
revised Easy example why complex numbers are cool
Concluding sentence
Dec
27
answered Easy example why complex numbers are cool
Dec
9
awarded  Caucus
Dec
9
awarded  Yearling
Sep
24
awarded  Autobiographer
Sep
12
awarded  Nice Answer
Aug
31
comment Proof of Gauss' Law of gravitation without reference to Newton?
"Where does the 4π come from?" That's Sir Isaac failing to put a factor $4\pi$ in the denominator of the universal law of gravitation.
Aug
17
revised Binomial triplets
added 196 characters in body
Aug
17
comment Binomial triplets
OEIS has listed quite a few tetrahedral numbers that are the sum of two other tetrahedral numbers: oeis.org/A034404 .