1,590 reputation
415
bio website
location
age
visits member for 2 years, 7 months
seen Jul 25 at 20:18

Dec
22
answered Prove that s is finite and find an n so large that $S_n$ approximate s to three decimal places.
Dec
22
answered Gamma function of negative argument
Dec
22
suggested suggested edit on Prove that s is finite and find an n so large that $S_n$ approximate s to three decimal places.
Dec
22
reviewed No Action Needed Finding a surface fitting equation for this set of data
Dec
22
awarded  Citizen Patrol
Dec
22
comment How can I systematically find the roots of $ x^4 + 1?$ Is there some algorithm?
Better. Although I'd simply expect this question to be closed as duplicate.
Dec
22
comment How can I systematically find the roots of $ x^4 + 1?$ Is there some algorithm?
Yes, those answers are much better and more welcoming. This just smacks an answer to the question, which is technically correct, but the techniques it relies on are not explained at all.
Dec
22
awarded  Custodian
Dec
22
reviewed No Action Needed Hartshorne's proof of Proposition 2.5, Chapter II of his book Algebraic Geometry
Dec
22
comment How can I systematically find the roots of $ x^4 + 1?$ Is there some algorithm?
How is someone who doesn't know how to find roots of $x^4+1$ helped by your answer?
Dec
22
revised How can I find $\sum_{k=1}^{1233}f(\frac{k}{1234})$
added 4 characters in body
Dec
22
comment How can I systematically find the roots of $ x^4 + 1?$ Is there some algorithm?
If you can understand this answer, you wouldn't have needed it in the first place.
Dec
22
comment How can I find $\sum_{k=1}^{1233}f(\frac{k}{1234})$
I like how you can solve for $f(1/2)$.
Dec
22
comment How many subsets of $\mathbb{N}$ have the same cardinality as $\mathbb{N}$?
@DougSpoonwood: see Asaf's answer for an explanation.
Dec
22
comment Simple equation misunderstanding
I don't know what you're doing wrong, but I'm getting a different value (in fact, the one you're looking for) for the arctan. How are you calculating it?
Dec
22
comment How can I find $\sum_{k=1}^{1233}f(\frac{k}{1234})$
Thanks to Mathematica for simplifying the terms, I wouldn't have voluntarily done this.
Dec
22
answered How can I find $\sum_{k=1}^{1233}f(\frac{k}{1234})$
Dec
22
comment How can I algebraically prove that $2^n - 1$ is not always prime?
I think the question can be interpreted as "prove that there are infinitely many $n$ such that $2^n-1$ is not prime". Otherwise, as @Hurkyl mentioned, you have already proved your own statement.
Dec
21
comment Closure in a product of topological spaces
What is the closure of a topological space? I know closures of strict subsets of spaces, and completions of metric spaces, but what are closures of spaces?
Dec
21
answered Why do some people use $+\infty$ instead of $\infty$?