10,817 reputation
42364
bio website proofwiki.org
location
age
visits member for 1 year, 11 months
seen Nov 29 '13 at 23:43

On a much-needed break. For pressing matters, see my contact details below.


A proud contributor to the Crusade of Answers -- more info on meta. Fellow knights include Julian Kuelshammer, rschwieb, anorton, and Shuhao Cao. We are recruiting: just visit the chat room. :)


A mathematics enthusiast caring to help others out. My most knowledgeable areas are logic and category theory. I also know a fair share about measure theory and functional analysis, along with the standard undergraduate curriculum.

When applicable, in the process of answering/helping out, I point people to the community effort ProofWiki which catalogues and rigorously founds proofs in all areas of mathematics.

I am not a native speaker of the English language, but I try to approximate this status; please feel free to point out any errors (perhaps the best way to do so is through chat or e-mail -- see below for the latter).


For those trying to contact me urgently cq. personally, you can direct an email to the following address (all letters lowercase):

my-user-name (at) my-affiliated-site (dot) org


Sep
24
awarded  Autobiographer
Jul
2
awarded  Curious
Apr
5
awarded  Necromancer
Feb
2
awarded  Taxonomist
Jan
9
awarded  Revival
Nov
29
comment Possibilities for changing one $1024$ banknote to banknotes from $\{2^i: i = 0,\ldots,9 \} $
...which leads to the conclusion that it has no place as an answer here.
Nov
29
reviewed No Action Needed How many buckets options are there for putting N balls in the buckets?
Nov
29
reviewed Reviewed Real Analysis: Convex
Nov
29
comment Real Analysis: Convex
Hello, welcome to Maths.SE. Thank you for your question! It is good practice on this site to add a bit of information on the context your question came up in, and to share your own work on it. It's also fine if you state that you're completely lost -- the information is helpful for answerers to gauge their answer on. For more information on asking a good question on this site, see here.
Nov
29
reviewed Reviewed Cardinality of “x−y∈Q”-equivalence class of 1/2 √
Nov
29
comment Possibilities for changing one $1024$ banknote to banknotes from $\{2^i: i = 0,\ldots,9 \} $
Your formula keeps notes from the first and second halves separate; this means you're overcounting by quite a lot.
Nov
29
revised Possibilities for changing one $1024$ banknote to banknotes from $\{2^i: i = 0,\ldots,9 \} $
added 21 characters in body; edited tags; edited title
Nov
29
reviewed Leave Open If a function is smooth is 1 over the function also smooth
Nov
29
reviewed Leave Open How prove this limit $\lim_{n\to\infty}\alpha_{n}=0$
Nov
29
comment bijection from $\mathbb{Q} - \{a\}$ to $\mathbb{Q}$ using elementary functions only?
I'm quite certain that OP was not looking for piecewise functions.
Nov
29
comment Find $\lim_{x\rightarrow 0} \frac{\cos x - 1}{x}$
This answer is circular, using the derivative of cosine.
Nov
29
comment Find $\lim_{x\rightarrow 0} \frac{\cos x - 1}{x}$
MacLaurin/Taylor series are not available, because this limit is used to derive them -- circularity lurks.
Nov
29
reviewed Edit Find $\lim_{x\rightarrow 0} \frac{\cos x - 1}{x}$
Nov
29
revised Find $\lim_{x\rightarrow 0} \frac{\cos x - 1}{x}$
added 18 characters in body
Nov
29
comment bijection from $\mathbb{Q} - \{a\}$ to $\mathbb{Q}$ using elementary functions only?
No need for vague tags. Less so as the tags you used actually are not vague, but precise terms for totally unrelated things.