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Jan
25
revised Maximum number of different diagonals obtained by column permutations
added 64 characters in body
Jan
25
comment Maximum number of different diagonals obtained by column permutations
Thanks Zackkenyon, my question is the latter: "What is the maximum number of diagonals among all such matrices?"
Jan
25
asked Maximum number of different diagonals obtained by column permutations
Dec
24
awarded  Notable Question
Nov
30
awarded  Favorite Question
Nov
27
awarded  Popular Question
Oct
23
awarded  Popular Question
May
8
awarded  Notable Question
May
2
comment (Logic) Formally writing a rational number in logic
thanks, I think the key idea "multiplying by a suitable integer, a common denominator of the coefficients of P ." is really useful. This way one can avoid rationals altogether.
May
2
comment Definable with parameters (Example)
Sorry for the confusion! What I meant is that is there any set that is definable with parameters but not definable without parameters?
May
1
asked Definable with parameters (Example)
May
1
accepted How to show that a theory T union a sentence $\varphi$ is consistent.
Apr
28
comment (Logic) Formally writing a rational number in logic
Thanks, this is an awesomely clear answer.
Apr
28
accepted (Logic) Formally writing a rational number in logic
Apr
27
revised (Logic) Formally writing a rational number in logic
added 44 characters in body
Apr
27
asked (Logic) Formally writing a rational number in logic
Apr
26
awarded  Yearling
Apr
26
accepted Gödel's Paradox — Every set of formulas is consistent
Apr
26
asked Gödel's Paradox — Every set of formulas is consistent
Apr
25
comment How to show that the property of being algebraically closed is reflected by elementary extensions?
Thanks! I wonder if is it true that any elementary extention of a non-algebraically closed field is also not algebraically closed?