How can I Reverse a Fibonacci number and find the numbers between a range 20 and 20000 tia sal2

Greetings All

I've been able to figure out how to get the next fibonacci number in a
sequence given just one number using the floor command see below

x := 987.23
floor((x+sqrt(5*x^2))*(1/2))

What I'm trying to figure out is:
1) floor doesn't take into account decimals and I would like to
2) I would like to be able to find the fibonacci numbers in reverse
between the range of 20 to 20,000

I am trying to model reflectivity data at a Mn-doped GaAs interface and hence I need to create a Kramers-Kronig Transform to determine the depth-dependent complex value of the index of refraction at specific beam energies.  The integral I am trying to solve is the following:
f[1](omega) = P(2/(Pi)*(∫)[0]^(infinity)(u*f[2](u))/(u^(2) - omega^(2))du),

I want to shade the region bounded by the curves x^2 and x^3 from x=0..1. Could you please help me with this. Thanks in advance!!

I am using Maple 13 for applications of Integratin. I want to plot region bounded by y=x^2 and line x=1. How can I do this in Maple? Thanks in advance!!

Hi,

we know that:

X_(n+1) =X_n - f(x_n)/f^\prime(x_n)

Now I am using the following commands for showing the 2nd order convergence of the above method:

> restart;
> f(a) :=0: 
> A := taylor(f(x), x = a, 4);
>
> B := taylor((D(f))(x), x = a, 4);
> C := series(e[n]-A/(D(f))(x), x = a, 3);
> simplify(subs(x-a = e[n], %));
 

it does not cancel e_n

I know there must be a better way of doint it. Can you please tell me?

Hello,

Hello,

I am a sheer beginner of Maple and have a very basic question. I want to poste a question on this board. But before that, I can not find a way to copy and paste the Maple command into this question form. Maple command can be copied into Microsoft Word as rich text, but that can not be copied into this question form. Could somebody tell me how to do it?

Tadashi

How to convert this equation?

RootOf(_Z^2+alpha+_Z, label = _L3)

and why this programme take long time to evaluate?

Hello,

Is there anything similar to the file selsction box in VB. I´ll give the user the possibility to choose which txt-file should be read in.

BR
CHR

Hi, i am new at this forum, and i was wondering if somebody could help whit a  non linear differential equations system, is it posible to know what kind of system is? (damped, overdamped etc) and the time of response, does exist any method to do that?, the system is this:

dp1/dt =exp-(c + p1 + q1)

dq1/dt=exp-(c+q1+p2)

dq2/dt = exp-(c+q2+p1)

dp2/dt = exp-(c + p2 + q2)

Hi all,

sorry for my cryptic previous posting. Here is my question again:

I am searching for an easy way to determine the sign of a function

m(a) = 1/4*(-2*g+ln(1-l+a)*g-(g*ln(1-l+a)*(ln(1-l+a)*g-4*g+8*d*a-8*y))^(1/2))/g .

More specifically, I want to find out whether m(a) can assume a positive value given that

(1+l-a) lies between 0 and 1 and all parameters (g,d,l,y) are nonnegative (I have plotted the function; the plot exhibits that the fct does not assume a value greater than or equal to 0. However, I want to have an algebraic solution).