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Dec
11
answered Evaluating $\int_{0}^{1} \left ( \ln \frac{1}{x} \right)^ndx$.
Dec
8
awarded  Caucus
Dec
8
answered Derivative=0 implies double root
Dec
7
comment How to rewrite double sum in matrix operation?
If the $y_{i}$ and $\alpha_{i}$ are just real scalars, why keep them separate? What is $(x_{i},x_{j})$?
Nov
28
answered Does $\left(\frac{\partial f}{\partial x}\right)^2=\frac{\partial^2f}{\partial x^2}$
Nov
23
comment Improper double integral
I've added some more detail. Does that answer your question?
Nov
23
revised Improper double integral
added 486 characters in body
Nov
23
comment Does $\sum_{n \ge 2}{(n\log^2(n))^{-1}}$ converge?
By $\log^{2}(n)$ do you mean $(\log(n))^{2}$ or $\log(\log(n))$?
Nov
23
comment Improper double integral
Isn't it a property of pdfs that $\lim_{u \to -\infty} \phi(u)=0$? You can certainly treat $z_{1}$ as fixed inside the integral.
Nov
23
answered Improper double integral
Nov
23
comment Improper double integral
Should that be $\partial z_{2}$ in the denominator? If not, no.
Nov
22
answered Number of roots of $x^3+2x-1$ in $\mathbb Q$
Nov
1
comment Is the reverse action of each action included in the generators for that group?
Sort of - an element might not necessarily generate its own inverse, but its inverse is certainly generated by some combination of operations. If the group is finite then an element will eventually generate its own inverse, though. Consider that an exercise!
Nov
1
comment Is the reverse action of each action included in the generators for that group?
If an element generates the group, then so does its inverse - is that what you mean?
Oct
31
revised What to do if the critical point is not a real number?
added 1 character in body
Oct
31
comment What to do if the critical point is not a real number?
Of course! Sorry, that should be the other way round - I'll correct it.
Oct
31
answered What to do if the critical point is not a real number?
Oct
30
answered Solving a differential equation 1st order
Oct
30
answered How can I prove $(a+b+c)!>a!b!c!$
Oct
27
answered Help with the integral $\int_{-b/2}^{\frac{\pi-10b}{20}}\frac{\mathrm{d}x}{x^2+bx+c}$