Reputation
1,260
Top tag
Next privilege 2,000 Rep.
Edit questions and answers
Badges
2 16
Impact
~125k people reached

  • 0 posts edited
  • 0 helpful flags
  • 66 votes cast
Apr
28
comment How does WolframAlpha calculate closed form approximations of irrational numbers?
Another interesting related topic is en.wikipedia.org/wiki/Mathematical_coincidence . Have a look at Heegner numbers, a striking example is that $\exp(\pi\sqrt{163})$ is almost integer.
Apr
28
comment How does WolframAlpha calculate closed form approximations of irrational numbers?
Try to search on "experimental mathematics" (in particular read the wiki article on this topic) and on the integer relation algorithms (in particular the PSLQ algorithm, which was selected as one of the "Top Ten Algorithms of the Century"). You will see that it is not a massively precomputed table lookup. The algorithm is proved to discover a relation, but the empirical part is always to provide an information on what to relate. Here it is in a way a table look up.
Apr
20
comment eigenoscillations of a sphere
Almost got dizzy by looking at the solution. Imagine what would happen to inhabitants ...
Apr
20
comment No font on axes in Plot3D graphics
Very interesting feature, it looks like MMA knowns how approximately minus and dot look like (they do not occupy the whole vertical space), but just want to conceal the symbols...
Apr
20
comment Finding very weak peaks
Just a philosophical question, imagine you find what you call the "weak peak", will it help you ? I mean, will it help you to solve the original problem?
Apr
12
awarded  Popular Question
Apr
9
comment How to get the long logic expression with a terse method
Your equations vary in time ...
Apr
7
answered double sum with condition
Apr
4
comment Rounding the Corners of a Shape
@AlexeyPopkov Thank you for testing the code. Mysteriously one comma disappear when editing... Now the code is corrected!
Apr
4
revised Rounding the Corners of a Shape
comma added in Polygon[l]}, {Red
Apr
2
awarded  Nice Answer
Mar
31
comment Possible bug with ticks with superscripts, Labeled and Export to PDF
possibly related mathematica.stackexchange.com/questions/47711/…
Mar
31
answered Rounding the Corners of a Shape
Mar
31
answered Plotting an ellipse given axial ratio and orientation
Mar
30
revised Perform matrix/tensor contractions more efficiently
added 199 characters in body
Mar
30
revised Perform matrix/tensor contractions more efficiently
added 782 characters in body
Mar
30
answered Perform matrix/tensor contractions more efficiently
Mar
25
answered What is the most efficient way to replace items in a list at periodic intervals?
Mar
20
comment Closed form probability random walk will hit k >=1 times in n steps
Make a substitution c[n,k]=1/2^n b[n,k] and solve it analytically.
Mar
20
comment Closed form probability random walk will hit k >=1 times in n steps
Isn't it contradictory: c[0,0]=1 according to the 1st rule and c[0,0]=0 according to the 2nd?