m0nhawk
Reputation
1,371
Top tag
Next privilege 2,000 Rep.
2 8 23
Impact
~7k people reached

 Jun 4 comment Number system and PI No, only with number system with $\pi$ as a base. Apr 19 comment Do we have $\sum_{n=1}^\infty 0=0$? Then this is completely different sums. Mar 12 comment Sign of a solution for an ODE There is a multiplication by constant in the first one, you can simply hide $\pm$ in there. Oct 27 comment generalization of geometric series $\sum_{k=0}^\infty x^{p(k)}$ It's impossible to find for arbitrary polynomial, but for some particular it's possible to find a closed forms. Probably in some elliptic theta functions. Sep 14 comment Does the following integral converge: $\int_6^{\infty}\frac{dx}{\sqrt{1+x^2}}$ Why won't you just evaluate it? Sep 13 comment Analysis of the function $y=x^{\frac{1}{x}}$ @ClaudeLeibovici I plotted $\Im x^{1/x}$ in Mathematica, it's not zero for $(-1,0)$. Sep 13 comment Analysis of the function $y=x^{\frac{1}{x}}$ It's complex valued for $x\le0$. Sep 7 comment Recurrence relation of the following sequence? It's simply only the $a_n = \lceil\frac{n}{2}\rceil$. Why even-odd? Aug 26 comment How to prove $\int^{\pi/2}_0 \log{\cos{x}} \, \mathrm{d}x = \pi/2 \log{1/2}$ @idm this can be easily integrated by parts. Aug 25 comment How do I integrate $\frac{\sqrt{1-k^2\sin^2 x}}{\sin x}$ @Jean-ClaudeArbaut Thanks for this reference. Why'd in physics I didn't encounter the one's, that can be expressed with elementary functions? Aug 25 comment How do I integrate $\frac{\sqrt{1-k^2\sin^2 x}}{\sin x}$ @Jean-ClaudeArbaut Maybe, as a physicist mine elliptic integrals are one, two, three complete/incomplete integrals. Aug 25 comment How do I integrate $\frac{\sqrt{1-k^2\sin^2 x}}{\sin x}$ @Jean-ClaudeArbaut It's definitely not an elliptic integral. It's actually can be expressed as a primitive functions. Aug 24 comment Quotient rule, one sign wrong @Paul Nope, you are correct, and the book answer is wrong. Aug 24 comment Why is the result of $-2^2 = -4$ but $(-2)^2 =4$? Because first one is $-(2^2) = -(2\cdot 2) = -4$ and the second one is $(-2)^2 = (-2)\cdot(-2) = 4$? Aug 23 comment How to solve this linear system using determinants and using matrices Move the $3y$ to the LHS in that equation... and be happy! Aug 22 comment How to find $\int \frac{x^4-4}{x^2\sqrt{4+x^2+x^4}} \,\mathrm dx$ @Aditya and what is the solution in textbook? Aug 22 comment What is the concept behind …? Concept of vector calculus. Aug 22 comment Integral of inverse of square root of a quadratic @Starior Because there are infinitely, but uncountable set of rings; and sum can only been used on a countable set of rings. Aug 21 comment calculus / algebra Is this from some physics textbook? Share the context. Aug 21 comment Integral of inverse of square root of a quadratic @Starior Yes. I used $+\delta$.