Does this series have an analytical solution?

In summary, the given expression is a geometric series and its analytical solution is 1 / (1 - e^-A). It converges for A > 0 and e^-An = (e^-A)^n for all A and n.
  • #1
FrankDrebon
9
0
Hi all,

Can anyone show how I'd work out the analytical solution to an infinite series of this form:

[tex]\sum\limits_{n = 0}^\infty {\exp \left( { - An} \right)}[/tex]

Thanks in advance,

F
 
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  • #2
FrankDrebon said:
Hi all,

Can anyone show how I'd work out the analytical solution to an infinite series of this form:

[tex]\sum\limits_{n = 0}^\infty {\exp \left( { - An} \right)}[/tex]

Thanks in advance,

F

It's just a geometric series Frank

[tex]\sum\limits_{n = 0}^\infty {\exp \left( { - An} \right)} = \frac{1}{1 - e^{-A}}[/tex]

Converges for A>0
 
  • #3
Just to fill in a detail:
[tex]e^{-An}=(e^{-A})^{n}[/tex]
For all A and n.

As uart said, this is a geometric series.
 

Related to Does this series have an analytical solution?

1. What is an analytical solution?

An analytical solution is a mathematical expression or formula that provides an exact solution to a problem. It is typically obtained through the use of algebraic equations, calculus, or other mathematical methods.

2. How do you determine if a series has an analytical solution?

The best way to determine if a series has an analytical solution is to try to express it in a closed form, or as a finite combination of known mathematical functions. If this can be done, then the series has an analytical solution. Otherwise, it may require numerical methods to find an approximate solution.

3. What are some examples of series with analytical solutions?

Some common examples of series with analytical solutions include geometric series, arithmetic series, and power series. Other series that can be expressed in terms of known mathematical functions, such as trigonometric or exponential series, also have analytical solutions.

4. Can a series have both an analytical and numerical solution?

Yes, it is possible for a series to have both an analytical and numerical solution. An analytical solution provides an exact solution, while a numerical solution is an approximation obtained through numerical methods. In some cases, a series may only have a numerical solution if it cannot be expressed in a closed form.

5. Are analytical solutions always preferred over numerical solutions?

It depends on the situation. Analytical solutions are generally preferred because they provide an exact solution and can be more efficient to calculate. However, in some cases where an analytical solution is not possible, numerical solutions may be the only option. Additionally, numerical solutions may be more accurate in cases where the analytical solution involves complex calculations.

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