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May
4
comment $g^q-q$ and $g^q-gq$ are primitive roots modulo $q^2$
Using $g$ and $q$ is confusing!
Apr
26
comment Reduction from Hamiltonian cycle to Hamiltonian path
@graphtheory92: Seems valid to me. What are your concerns?
Apr
17
comment Proving that $\lim_{n\rightarrow\infty}n(a_{n+1}-a_{n})=1 \implies a_n$ diverges to $\infty$
Please use more informative titles.
Apr
17
comment How can I find if $\sum_{n=1}^\infty {n! \over 10^n} $ converges or diverges?
Please use more informative titles. The previous title you had, was on par with "Help!".
Apr
17
comment Simplifying Sum
@Guest: Using binomial theorem. It is a standard technique. You don't need to know RHS for it.
Apr
16
comment Simplifying Sum
Without the algebra precalculus tag, the left side is $$\int_{0}^{1} (1-x)^n x^m \text{d}x$$ which is a Beta integral...
Mar
29
comment Diophantine system of two equations with four variables
+1: More accessible to a 9th grader, than complex numbers I suppose.
Mar
28
comment Counting the number of integers $i$ such that $\sigma(i)$ is even.
Is this an algorithm problem? Assuming it is, retagging as elementary-number-theory.
Mar
26
comment Calculation of limit without stirling approximation
A previous answer of mine proves this in a completely elementary fashion: math.stackexchange.com/a/131084/1102. Falls right out of Proposition E.
Mar
26
comment Can the sum of reciprocals of a set without density converge?
Convergence implies density is zero. See: math.stackexchange.com/questions/5932/…
Mar
19
comment Aproximation of $a_n$ where $a_{n+1}=a_n+\sqrt {a_n}$
+1: Nice.......
Mar
19
comment Aproximation of $a_n$ where $a_{n+1}=a_n+\sqrt {a_n}$
This is not pedantry. I don't think this is as trivial as you seem to be implying. Unless you have a proof, you are just handwaving. Anyway, you are free not to elaborate, and I am free to leave the downvote intact.
Mar
19
comment Aproximation of $a_n$ where $a_{n+1}=a_n+\sqrt {a_n}$
Please take at least a day or two before accepting an answer. In this case, the accepted answer is incomplete.
Mar
19
comment Aproximation of $a_n$ where $a_{n+1}=a_n+\sqrt {a_n}$
The heuristic is only a first step. Making it rigorous is the hard part. -1 till there is a proof. Sorry.
Mar
18
comment Quotient of a regular language
@AstroNauft: You don't need to determine anything. It is a non-constructive proof. $L$ could be any language.
Mar
18
comment The limit : $ \lim _{x \to \infty } \sqrt{x^2 +x} - \sqrt{x^2 +1} $
Related: math.stackexchange.com/questions/30040/…
Mar
17
comment How to show that $\lim_{n \to +\infty} n^{\frac{1}{n}} = 1$?
@ADG: It is my name, I will spell it as I want! :-). Just kidding :-). Apparently, it is actually Aryabhata and not Aryabhatta. In fact I had it as Aryabhatta till ShreevatsaR corrected me.
Mar
8
comment Inequality between real numbers $a^ab^bc^c<(abc)^{\frac{a+b+c}{3}}$
If I haven't made any mistake that is... This looks too simple!
Feb
10
comment Comparing $\pi^{e}$ and $e^{\pi}$
@NikolajK: Thank you for the suggestion! Done.
Feb
1
comment Irrational numbers in reality
@AsafKaragila: Thanks! Did not know the 60 day thing. The flag was declined with a comment that this is not about physics (which I disagree with) and it is too late to migrate (they didn't mention the 60 day thing).