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visits member for 2 years, 8 months
seen Dec 7 at 21:45

Jan
2
comment Are there real-life relations which are symmetric and reflexive but not transitive?
Surely this relation is not reflexive for newborns...
Dec
29
comment How to prove that something is definable or not definable in a given structure?!
Dear André, I am currently doing a little undergraduate research project in o-minimal structures. Thank you for showing me that this is actually something more people know about :P
Dec
28
comment A challenge by R. P. Feynman: give counter-intuitive theorems that can be translated into everyday language
This theorem would fail Feynman's judgement for the same reason that Banach-Tarski is not an example.
Dec
27
comment Consider the sequence 01110100…
Induction?[filler]
Dec
26
comment The cardinality of $\mathbb{R}/\mathbb Q$
Awesome.[filler]
Dec
26
comment The cardinality of $\mathbb{R}/\mathbb Q$
So why exactly are they both size continuum?
Dec
25
comment Rouche's theorem
So... what did you try?
Dec
24
comment Studying Math, All Over Again
With all due respect, Khan is not mathematics. Khan is a list of courses in passing exams.
Dec
23
comment Finding $\lim_{x\to \pm\infty}f(x)$ where $a,b>0$
It's bounded from above by $(a+b)/2$
Dec
23
comment Question about dynamical behavior near point
What are your own thoughts...
Dec
22
comment Graph of functions
That's not what you asked for.
Dec
22
comment Graph of functions
wolframalpha.com
Dec
22
comment Supremum of continuous functions is continuous?
What is $H^1(\Omega)$? Forgive my lack of knowledge of functional analysis.
Dec
22
comment Maximum absolute deviation
Dear Juan, you really need to work on your mastery of the English language if you want useful comments. Many of your questions are hard to understand, and I, for one, do not understand what you want from us in this question. Could you rephrase it?
Dec
22
comment how to make a matrix a magic square?
There are many "matrix problems". Could you change the title to something more useful, such as "how to make a matrix a magic square"
Dec
22
comment Algebra question resubmited
@DavidMitra: only because of the later edits by Crete and amWhy after my comment, and the question is still not clear to me.
Dec
22
comment Differential Equation
And if you're editing anyway, use MathJax: meta.math.stackexchange.com/questions/5020/…
Dec
22
comment Differential Equation
Integrate what twice? Please clarify your question to get more useful comment and help.
Dec
22
comment Differential Equation
Well yes, that clearly is your question, but what approach are you trying, because I don't think this is very clear from what you wrote.
Dec
22
comment Differential Equation
In that case, what are you trying to do (in terms of equations)?