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Sep
25
reviewed Approve what does it mean… $P((x_1\in A)\cap (x_2\in (A\cap B))$?
Sep
25
revised Solving $\lim_{x\to0}\frac{x}{\sqrt{3+x}-\sqrt{3-x}}$
typo
Sep
17
comment Probability problem on picking of colored balls from bags.
Put all white balls in in a bag an all black balls in the other bag. Choose a bag and then choose a ball from the chosen bag. What is the probability that it is a white ball?
Sep
13
reviewed Approve Find inverse of $7x^{2}-112x+448$
Sep
12
revised Compute operations with fractions using calculator
typos in sample
Sep
11
revised Proof of Kolmogorov-Smirnow two-sample test
deleted 1 character in body
Sep
11
comment Integral $\frac{x^{1/4} }{ x^{1/2}-1}$ dx
you should learn some basic latex. this is your 6th post and you are no able to write powers of x in latex.
Sep
11
answered Convergence/divergence of: $\sum_{n = 2}^\infty \ln\left( 1-\frac{1}{n^2}\right)$?
Sep
3
reviewed Approve Solve L'Hopitals problem
Sep
3
comment Numbers between $200$ and $1200$ that can be formed with the digits $0,1,2,3 $
is 230 allowed (because it is built by 2,3 and 0) or is it not allowed ( because it is viewed as 0230 and therefore the digit 0 is used two times)?
Sep
2
revised Prove $b>1, r>0 \implies b^r > 1$
typo
Sep
2
answered Prove $b>1, r>0 \implies b^r > 1$
Sep
1
revised Prove $b>1, r>0 \implies b^r > 1$
added 573 characters in body
Sep
1
comment Prove $b>1, r>0 \implies b^r > 1$
You shoul add your comment about what you can already use to your question, because it essential for the answerers to know about it.
Aug
31
reviewed Approve a certain simple continued fraction
Aug
24
revised Geometric sequence problem
latex
Aug
20
answered Interesting and unexpected applications of $\pi$
Aug
16
comment $u=xf(xy)$, show that $xu_{xx}-yu_{xy} = 0$
So please post the solution as an answer
Aug
16
comment $u=xf(xy)$, show that $xu_{xx}-yu_{xy} = 0$
There is no $f_{xx}$ or $f_{xy}$ but only an $f'$ or $f''$
Aug
16
comment $u=xf(xy)$, show that $xu_{xx}-yu_{xy} = 0$
your calculation of $u_x$ is wrong. Choose $u(x,y)=f(xy)=c$ then you get $u_x=c$ and that is wrong.