Closed-Form Solution for f(A,B) Equation

In summary, the conversation revolves around a function f(A,B) and its properties, specifically its form as a sum involving exponentials. The function is related to calculating the density operator for a particle on a circle and involves elliptic theta functions. The conversation also mentions a related question and a Wolfram Alpha input for the function.
  • #1
tom.stoer
Science Advisor
5,779
172
Does anybody know a closed for

[tex]f(A,B) = \sum_{n\in\mathbb{Z}}e^{-Bn^2 + iAn}[/tex]

with A real and B positive.
 
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  • #3
I can't believe that.
I tried to calculate the density operator in position rep. for a particle on a circle. You get the exp(iAn) term from the eigenfunctions on the circle; A contains the angle. And you get the exp(-Bn2) from exp(-H/T).
So it's nothing exotic.
 

FAQ: Closed-Form Solution for f(A,B) Equation

What is a closed-form solution?

A closed-form solution is an equation or formula that can be written in a finite number of standard mathematical operations, such as addition, subtraction, multiplication, division, and exponentiation. It is also known as an explicit solution because it explicitly defines the relationship between all variables in the equation.

What is f(A,B) in the closed-form solution equation?

f(A,B) is a function that represents the relationship between the variables A and B in the closed-form solution equation. The function can be any mathematical operation or combination of operations that produces a value when given specific values for A and B.

What are the benefits of using a closed-form solution?

Closed-form solutions provide a clear and concise way to express mathematical relationships between variables. They also allow for easy analysis and manipulation of the equation, making it easier to understand and solve complex problems.

How is a closed-form solution different from other types of solutions?

A closed-form solution differs from other types of solutions, such as numerical or iterative solutions, in that it provides an exact solution rather than an approximate one. It also allows for direct calculation of the solution, without the need for iterative or trial-and-error methods.

What are some applications of closed-form solutions in science?

Closed-form solutions are commonly used in physics, engineering, and other scientific fields to model and solve complex systems. They are also used in statistical analysis and data modeling to describe relationships between variables. Additionally, closed-form solutions are often used in computer programming to optimize algorithms and improve computational efficiency.

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