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7h
comment How to prove complexity of algorithms
No. $\log(0) = -\infty$, so if $\log(something) \to -\infty$ then $something \to 0$.
7h
comment Proving that $\cos(\frac{\arctan(\frac{11}{2})}{3}) = \frac{2}{\sqrt{5}}$
Submit it anyway. If your work is independent, I see no problem. There are no patents on answers here.
7h
comment solving a non-linear (trigonometric) system of equations with two equations and two variables
It's a lot easier to work with if you use $a, b, c$ instead of $\alpha, \beta, \gamma$. (Interesting typo - I entered \aloha instead of \alpha.)
7h
comment $2^k+3$ : Primality Brute Forcing Theory Below The Square Root
It seems that you are trying to determine the primality of these numbers. It might be good to state that at the beginning.
7h
answered How to prove complexity of algorithms
10h
answered A good way to approximate $\cos(x)$ for larger angles
10h
comment Suppose $1>a_n>0$ for $n\in \mathbb{N}$. Prove that $\prod_{n=1}^\infty (1-a_n)$ converges if and only if $\sum_{n=1}^\infty a_n<\infty$.
OP meant that the product converges to zero iff the sum diverges.
10h
comment Proof that for any interval (a,b) with a<b in the real numbers contains both rational and irrational numbers?
Integer part or floor. $\lfloor x \rfloor$ is the largest integer $\le x$.
23h
comment How to prove if $5/2 < x < (5/4)(1+\sqrt2)$, then $25/(x(2x-5)\ge 8$
It depends on the problem. Of course, if this hadn't worked, I wouldn't have submitted the answer.
1d
comment How do I deal with a floor function is a system of equations?
Your answer is more complete than mine. Nice finish.
1d
comment Show that the integer nearest to $\frac{n!}{e}$ $(n \geq 2)$ is divisible by $n − 1$ but not by $n$.
Nice answer. Yup.
1d
answered If a is an arbitrary integer, then $6|a(a^2+11)$
1d
answered How do I deal with a floor function is a system of equations?
1d
answered How to prove if $5/2 < x < (5/4)(1+\sqrt2)$, then $25/(x(2x-5)\ge 8$
1d
answered How is this limit solved?
2d
comment How do we find more appropriate constants for expansions of functions?
Least squares fit: Minimize $\int_a^b (f(x)-p_n(x))^2 dx$, where $p_n(x)$ is a polynomial of degree $n$.
Feb
8
answered Find $\lim_{n\to\infty} (1+\frac{1}{2}+…+\frac{1}{n})\frac{1}{n}$
Feb
8
revised If $\lim_{x\rightarrow \infty}\left[\left(x^5+7x^4+2\right)^c-x\right]$ is a finite, Then limit is
fix formatting error
Feb
8
answered Prove $\left(1+\frac{x}{n}\right)^n < e^x$, where $x$ is any positive real number and $n$ is any positive integer.
Feb
7
comment Finding the limit of a sequence $\lim_{n \to \infty} 2^{2n+3}\left(\sqrt[3]{8^n+3}-\sqrt[3]{8^n-3}\right)$
I've made that type of mistake, too, and then rushed to fix it.