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Jan
17
revised $g\circ f$ bijective iff $f$ and $g$ bijective?
edited tags
Jan
17
comment Evaluate this integral using cylindrical coordinates
I did it by Maple 18
Jan
17
revised Evaluate this integral using cylindrical coordinates
added 144 characters in body
Jan
17
answered Evaluate this integral using cylindrical coordinates
Jan
17
answered Multiplication in field Z5
Jan
17
comment Group of order $2n$ and subgroups of order $n$
I think you should assume there are two such that subgroups and then assume if their intersection is emty or not!
Jan
16
comment Translating an equation from multiplicative to additive form
Is your group Abelian?
Jan
12
revised the number of the conjugacy class sizes of $S_n$
edited tags
Jan
12
revised Minimum value of $\frac{(1 + x + x^2)(1 + y + y^2)}{xy}$
added 6 characters in body; edited tags; edited title
Jan
12
awarded  Cleanup
Jan
12
revised How to evaluate this Integral $\int { {\sqrt{5^2+K^2}}dK \over {\sqrt{10^2+K^2}K}} $
rolled back to a previous revision
Jan
12
comment Discussion of $Z(A_4) = \{e\}$
Please paraphrase your second question again.
Jan
12
revised Discussion of $Z(A_4) = \{e\}$
edited tags
Jan
11
revised Proof that the multiplicative groups $\mathbb{R} - \{0\}$ and $\mathbb{C} - \{0\}$ are not isomorphic.
added 19 characters in body
Jan
11
revised Seperation of variables algortithm.
edited tags
Jan
11
revised Trick to solve this limit $\lim_{x \to\infty} \sqrt{x^2+3x}-x$
edited tags
Jan
11
comment How do you plot the graph of $y = \sin(x)+\cos(x)$ by converting it to another form?
چه خوب که این سیستم فارسی رو پشتیبانی میکنه. موفق باشی همشهری! +1
Jan
11
comment Is a group defined by its generator set and relations?
For that exercise, you can use Todd-Coxeter Al. to find the orders of some certain finite groups. It really works!
Jan
11
revised what's the equation of helix surface?
edited tags
Jan
11
revised Helix around helix parametric equation?
edited tags