943 reputation
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bio website a.b.c.d
location Paris, France
age 55
visits member for 3 years, 7 months
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Apr
25
comment what is the difference between field and group in algebra
My formulation -- I will try to edit it, may give a false impression. Groups actually arose first under this name both in the study of equations designed and used by Galois as "Groups of substitutions" operating on symbols and by Cauchy as well, at the same time, operating also on points of geometrical figures designed by letters.
Apr
25
answered what is the difference between field and group in algebra
Apr
25
revised What is a natural isomorphism?
Several rewordings and a few things more explicitely stated.
Apr
25
revised What is a natural isomorphism?
corrected typo.
Apr
25
suggested suggested edit on What is a natural isomorphism?
Apr
25
revised What is a natural isomorphism?
added a form of conclusion
Apr
25
answered What is a natural isomorphism?
Apr
13
comment why have we chosen our number system to be decimal (base 10)
There was the russian Setun computer system among others.
Apr
10
awarded  Nice Answer
Apr
10
answered Galois groups of polynomials and explicit equations for the roots
Apr
10
answered Is there a third dimension of numbers?
Apr
10
comment Is there a third dimension of numbers?
@sis440: You mean Frobenius. More broadly, you might also like to lookup theorems by Dickson, Artin and Wederburn which gives a broader picture of the classification of algebra.
Apr
4
comment What is a Structured Polyhedron?
Thanks for the bounty. I will post here more (graphic) details in a few days.
Apr
1
comment What is a Structured Polyhedron?
(following of comment above) In fact, the two are possible independently and I have first to check what James Record did. As I wrote I believe that at least, the faces of his structured polyhedra contained the "structural" points (traces of smaller polygons). He may have counted in inner "structural" points (traces of smaller polyhedron) -- unfolding them in 4D would make things clearer. Whatever his choice (I will come back about that), it will certainly suggests new sequences to be added to the OEIS and a lot of clarification.
Apr
1
comment What is a Structured Polyhedron?
Your question is in fact two questions: boundary of faces ? boundary of the polyhedron ?
Mar
31
answered What is a Structured Polyhedron?
Mar
31
answered Good Book On Combinatorics
Mar
31
awarded  Supporter
Mar
31
awarded  Editor
Mar
22
awarded  Teacher