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 Civic Duty
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Jul
19
comment How many options are there for creating a number from the digits 123454321?
you should add this to Wyctus anwser
Jun
27
awarded  Civic Duty
May
22
comment Is it possible to show that a particular theorem or its negation is provable, without knowing which of the two is true?
Maybe what he's referring to those theorems for which we don't know a proof, like P=NP: is it even provable?
May
21
comment How to appreciate Fermat's last theorem?
@bill nevertheless, it's a perfect example of the true importance of hard problem proofs: new techniques are developed, which are more important on their own than the theorem for which they were invented
May
16
revised (Soft) What maths should I concentrate on at 16-18 years old?
formatting improvements
May
16
suggested approved edit on (Soft) What maths should I concentrate on at 16-18 years old?
Apr
11
suggested rejected edit on If a space $X$ has no isolated points, then nor does any dense subset of $X$.
Apr
11
revised Fun, interesting, slightly advanced books
improved formatting
Apr
11
suggested approved edit on Fun, interesting, slightly advanced books
Apr
2
comment Finding the area under curve without using rectangles
@sayan chattopadhyay actually Simpson's method works with every integrable function, non only with parabolas
Mar
16
comment How can I find $\lim_{x \to 0}\left(\frac{e^{2\sin x}-1}{x}\right)$ without l'Hopital's Rule?
Yes, probably, I'm reading from my phone so the MathJax is not formatted, but from what I see is the same
Mar
16
comment How can I find $\lim_{x \to 0}\left(\frac{e^{2\sin x}-1}{x}\right)$ without l'Hopital's Rule?
It's a widely known limit @konstantinos, the proof I know is based on the proof of a similar limit with the logarithmic function, that in turn it's based on the definition of $e$ as the limit of $\left(1+x\right)^\frac{1}{x}$ when $x\to 0$
Mar
2
comment How long does it take the average voter to vote?
+1 " you could afford each person to take 24 minutes": this is a much more intuitive interpretation, and I think more correct too
Jan
8
comment Order of infinitesimal of $\frac{\cos x}{x}$b for $x \to \infty$
Sorry I thought it was clear: it's just the number $\alpha$
Jan
8
asked Order of infinitesimal of $\frac{\cos x}{x}$b for $x \to \infty$
Nov
26
revised Notation for Derivatives with Respect to Time
added 1 character in body
Nov
17
asked Is this identity correct?
Nov
8
comment Domain of a solution of an ODE
Well, it isn't, it's a series of segments goo.gl/2iKqlP. However check my answer edit.
Nov
8
revised Domain of a solution of an ODE
added consideration about the derivative domain
Nov
7
answered Domain of a solution of an ODE