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May
9
comment can I show this set is closed?
@DavidMitra I would go so far as to call this a duplicate of that question. Do you agree?
May
9
comment can I show this set is closed?
No, you cannot.
May
9
comment The Category of Small Categories: a Zoo of Functors.
Can you give an example of how it would be useful?
May
9
comment The Category of Small Categories: a Zoo of Functors.
I didn't downvote, but I'm not really sure why one would want such a site.
May
9
comment Question with Isolated Points
The idea is to find an interval around the isolated point which does not contain any other element of the set.
May
9
comment Limits Problem worked 2 ways gives 2 different answers
The complex conjugate, or just the conjugate?
May
9
comment What is the optimal strategy for this 2 player game?
@reddy Which contest? Can you provide us a link to confirm this?
May
8
comment Irreducible polynomial with given discriminant
Do you mean $\sqrt{D}\in K$?
May
8
comment Using math to help people
Our most upvoted question of all time might be helpful.
May
7
comment Precise meaning of “Solution in radicals”
@GregBuchholz The first definition I give is quite standard; it should be in any algebra textbook which introduces Galois Theory. In Dummit & Foote 3rd Ed. it is on page 627. The second is just a rephrasing of the first in non-field theoretic terms, which I don't have a reference for.
May
7
comment Precise meaning of “Solution in radicals”
@GregBuchholz I am making the assumption for this answer that $f$ is over $\mathbb Q$; it simplifies notation and is more relevant to the historical usage of the phrase and the context of your question IMHO.
May
7
comment Analysis Limit Question Confusion
Hint: multiply both sides by $1-r$.
May
7
comment Precise meaning of “Solution in radicals”
@GregBuchholz Only one of the 6 needs to hold. For $x^2-2$, we could have $x_1=2$ and $x_2=\sqrt{2}$, since $x_1$ satisfies 1 and $x_2$ satisfies 6.
May
7
answered Precise meaning of “Solution in radicals”
May
7
comment Precise meaning of “Solution in radicals”
Do you know what a field extension is?
May
6
comment Is this an ideal of $\Bbb Z \times \Bbb Z$
You can write $a2n=2na$ and $b3m=3mb$ if that's what you're asking.
May
6
comment Is this an ideal of $\Bbb Z \times \Bbb Z$
$\mathbb Z\times \mathbb Z$ is most definitely commutative.
May
6
revised poisson distribution to get pdf
rolled back to a previous revision
May
6
reviewed Approve Strange graph problem
May
5
comment How do you minimize “hinge-loss”?
If you mean $\max(0,1-yf(x))$, then yes.