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May
20
comment References for limit superior and limit inferior of functions
Any book on "Analysis" in the maths section of a University library will do.
May
20
comment A question on Join homomorphism and Ideals
The name was probably chosen because there is some much more abstract setting (Boolean algebras) where the two notions of ring theoretic ideal and order theoretic ideal coincide. As Poincare said: Mathematics is the art of giving the same name to different things.
May
20
revised A question on Join homomorphism and Ideals
expand on the meaning of the theorem.
May
20
comment A question on Join homomorphism and Ideals
I don't know what "the lattice representation of a ring ideal" is. Maybe some of your confusion also arises from the two notions of lattice. One is in order theory en.wikipedia.org/wiki/Lattice_%28order%29 and the other is a subgroup of $\mathbb{Z}^n$: en.wikipedia.org/wiki/Integer_lattice
May
19
answered A question on Join homomorphism and Ideals
May
8
answered Ideals - A Geometric Interpretation?
May
6
awarded  Editor
May
6
revised Prove that $4x^2-8xy+5y^2\geq0$ - is this a valid proof?
fix link
May
5
awarded  Yearling
May
5
answered Prove that $4x^2-8xy+5y^2\geq0$ - is this a valid proof?
Apr
14
comment Coordinate ring of general linear group
$D-y$ is wrong. $y$ should be a multiplicative inverse of the determinant, not equal to it.
Jan
15
awarded  Critic
Dec
21
awarded  Caucus
Mar
12
awarded  Commentator
Mar
12
comment Why is integer programming in fixed dimension easier than in general?
Is this the case for integer programming without fixed dimension?
Mar
11
asked Why is integer programming in fixed dimension easier than in general?
Oct
31
comment Is a left invertible element of a ring necessarily right invertible?
You bet me to the finish line... Basically just the fact that left-inverse and right-inverse are not the same thing. Also all this square summable stuff is a red herring. You can take $\mathbb{Z}^\mathbb{N}$.
Oct
31
asked Inclusion-minimality of a lattice basis
Oct
27
comment Primary decomposition of ideals
@YACP The restriction to monomial ideals is not necessary. There are algorithms that compute primary decompositions of ideals in polynomial rings.
Oct
8
comment General question on parameter functions
I don't see $\gamma'(t) \neq 0$ as such a central condition. Do you mean that the derivative should exist?