Hi everyone,
concerning serie representation of psi function.
In te solution of bessel function of the second kind we have the following expressions for the psi functions
psi(m+1) and psi(n+m+1) then they give the series for the two psi functions ie(or digamma function)
sum
k from 1 to m of...
Hi members,
I have a problem with the computation of residues involve the gamma functions.
(see attached Pdf file)
Can you show me for the first residue with the arrows, or give a hint or a link.
Thank you
Hi members,
Laplace transform using differential equations.(see attached PDF file)
My question d/ds(s^2 y- s Y(0)-Y'(0).).......
Y(t)=sin(sqrt(t)) Y(o)=0
Now Y'= cos(sqrt(t)/2sqrt(t) Y'(0)=infinity
d/ds (Y'(0)=?? can it be treated as a constant or can we change limit and...
Hi members,
see attached Pdf file.
For a<0,write b=-a and let x=bt.Then
My question:
how becomes the denominator x+a to 1-t??? I don't see it
Thank you
Hi dear members,
I have a problem with the following integral:
Integral 1/sinh^2(x/2) from -inf to +inf =-2 coth(x/2)
must I consider it as a principal value integral???
Thank you
Hi members,
I have a problem with fourier transforms.
There are two attached Pdf files.
My questions are on the Pdf files.Give me a little help.
Thank you
Belgium 12
Hi
I have a little problem with the integrals of the following functions.
integral from 0to 2pi ∫sin^2(nθ+ψ)dθ=∫cos^2(nθ+ψ)dθ=pi
ψ=the phase angle.They occur in the theory of vibrations.
Is it appropriate to set ψ=0
Thank you
Fortran
Hi,
Thanks to Uart for his help.I changed the program with your suggestions and it works fine.
Here is the program:!
! Numerical Mathematics and Computing, Fifth Edition
! Ward Cheney & David Kincaid
! Brooks/Cole Publ. Co.
! Copyright (c) 2003. All rights reserved.
! For...
Hi,
Below is a fortran program to calculate the roots of an equation by newton's method.
I compile the program with the free compiler g95:
g95 -c newton.f95 then g95 newton.f95 -o newton.exe
When I run the program newton.exe I get the error can't assign value INTENT(IN)::x to...
Hi,
I use scilab 5.2.2
Ik have a problem to find the zeros or roots of the bessel functions J0,J1...
Whel I write besselj(0,3) I get the value of the bessel function Jo(3)=0,2600520.
Can someone help me how to find the zeros of these bessel functions in scilab.
Thank you
kind...
Hi,
yes you are right.
But it's my fault,I forgot something.
I have to show this inequalities for z->infinity as a lower and upper bound in a complex
integral.
Sorry
Hi,
I need two simple proofs of complex inequalities.
1) |1-z|/|z|<2
2)|1+z|/|z|>1/2
Ik need them for a bound of a complex integral.It's not homework
Thank you
It's to satisfy the boundary conditions at 0 and pi.
solutions are u(x,y)=A exp(ny) + Bexp(-ny)
or =a sinh(ny)+bcosh(ny)
or =cosh(ny)+cosh n(y-pi) this satisfy thr BC at 0 and pi
The laplace equation is invariant under translation
belgium 12
Hi,
problrm with complex integral.Consider the integral
\int_{0}^{\infty}\frac{(x^a-1)}{x^3-1}\,dx
use the branch 0<phi<3pi/2 and an idented contour at z=0 and z=1.(circular contour in the
upper half plane)
a)show that the integral can be written in terms of the integral...
HI,
I start to understand the structure of latex.Icreated my first latex file with an editor.
I runned latex on the tex file and I got dvi file.With preview I could see the text in ps or Pdf.
It was a downloaded example.
Now:
1)I run latex from from the prompt c:\ you click in...
use of latex
hi,
I have downloaded miktex 2.7(basic) and AMS latex.
They are both installed,but how I start the two programs,and write math.expressions.
I know maybe it is easy,but for me everything is new.
Thanks for your help
Use of "Latex"
Hi,
I want to use Latex.I never heard about latex before.
If it runs on my computer:
1)Where can I download the files I need.
2)How to install
3)Where can I find the source code for writing the mathematical expressions.
My computer:
O.S/:Windows...
Hi,
mathwonk
yes that's.for three variables I think you have to diagonalize the matrix.First you you must
compute the eigen-values of the matrix .
Thank you for your help.
Hi,
What I really mean is:
you have a general equation of the second order in three variables and by translations
and rotations to remove Xy-Xz and yz terms you transform it to the canonical forms
of quadrics.(ellipsoids,hyperboloids,cone......)
Bye