913 reputation
816
bio website a.b.c.d
location Paris, France
age 54
visits member for 3 years, 4 months
seen Jul 23 at 16:18

Not much to say.


May
20
suggested suggested edit on Totally ordered abelian group
May
20
comment Logic Puzzle of the age of three sons
@Amy : see my answer to R. Israel. No this is not a standard, just a possible thought process of the problem's author. As these problems are supposed to make youngsters manipulate properties of integers, this made-up rule is a way to introduce the composite/prime distinction in the problem.
May
20
comment Logic Puzzle of the age of three sons
@Robert Israel: I agree with you, and I should not have presented my interpretation as if I believed that buildings are somehow figurate numbers. Just a hint or a trick toward a possible solution. As user6312 said, we are not doing mathematics here. We are just trying to outguess/reverse engineer a very vague and inconsistent fantasy world which is more or less shared among variants of these kinds of problem. This riddle is only a support for successive hypothesis and manipulation of integers, not a scientific slice of reality.
May
19
comment Logic Puzzle of the age of three sons
@svenkatr : You are right that this way was not listed. But if there is (one) older son, 1,6,6;13 is not possible.
May
19
comment Logic Puzzle of the age of three sons
@El'endia : a building has several floors with the same number of windows at each floor, so the number must be composite and not prime.
May
19
comment A Question about p-primary Group
@Arturo: I asked only to better understand etiquette on math.SE.
May
19
awarded  Tag Editor
May
19
revised algebraic-topology wiki excerpt
added 142 characters in body
May
19
suggested suggested edit on algebraic-topology tag wiki excerpt
May
19
wiki created algebraic-topology excerpt
May
19
revised Dual modules and first cohomology
edited tags
May
19
revised mathieu group M23?
edited tags
May
19
revised Inverse-closed subsets generating simple groups in finitely many steps
edited tags
May
19
revised Showing groups of order $p^{k}(p+1)$ are not simple, p prime
edited tags
May
19
revised Alternating and special orthogonal groups which are simple
edited tags
May
19
revised Simple Group Theory Question Regarding Sylow Theorems
edited tags
May
19
revised No simple group of order 300
edited tags
May
19
revised Why $PSL_3(\mathbb F_2)\cong PSL_2(\mathbb F_7)$?
edited tags
May
19
revised projective limit of simple groups
edited tags
May
19
revised questions about simple groups
edited tags