Recent content by LHS

So say something like an=i^n/n^0.5 and bn=an=-i^n/n^0.5 Excellent! that seems to work, thank you very much, now I can finally go to sleep

thank you very much for your time, I will do that :)

how about 0<=(a-b)^2 2ab<=a^2+b^2 2ab<=a^2+b^2 therefore 2*sum(ab)<=sum(a^2)+sum(b^2) Where the RHS converges As the LHS converges absolutely sum(ab) converges? Any ideas about the examples? [PLAIN]http://img35.imageshack.us/img35/9916/unledis.png this is from a past...

Homework Statement [PLAIN]http://img11.imageshack.us/img11/4384/unledqr.png Homework Equations The Attempt at a Solution How do I show the series of an*bn converges?

Thanks :) It is annoying when they set questions where there just seems to be some arbitrary factorization which you can spend hours on and learn relatively little from. Have a good day!

-(x+y-z)^2-(x-y+z)^2-(-x+y+z)^2 Then let r=x+y-z s=... seems to work! Thanks though!

Hmm.. yes I have covered some of that, but nothing I can see that'll help in this situation. the question seems to be wanting you to use a Jacobian etc.. maybe involving the first part

Homework Statement [PLAIN]http://img542.imageshack.us/img542/5600/unledsn.png Homework Equations The Attempt at a Solution The first part is fine, just struggling to find a change of variables that'll help, tried spherical due to the x^2+y^2+z^2, didn't help enormously Thanks! (from sheet...

ok.. so considering limits for dx,dy,dz z is between a and b y is between a^2/z and b^2/z but what could be do for x?

I tried the substitution of X=yz, Y=xy, Z=xz I came out with an answer, but it was extremely messy, due to the Jacobian

So does this imply that z<x<z, therefore x=z?

Homework Statement [PLAIN]http://img9.imageshack.us/img9/4537/unledow.png Homework Equations The Attempt at a Solution Hi, does anyone know how to find the integral that needs to be evaluated here? I can't understand how to find it from the region edit: Oh and this is from here, not a take...

Homework Statement [PLAIN]http://img689.imageshack.us/img689/6294/08052011193408.jpg Homework Equations The Attempt at a Solution Hi, I would really appreciate some help on part a, I'm simply getting no where. This is classed as a geometry question, but I haven't covered...

solved!

Homework Statement [PLAIN]http://img812.imageshack.us/img812/5261/unleduqi.png Homework Equations The Attempt at a Solution Can anyone help with part (a)ii, is pk=(1/2)^k? I can't see how to find qk