Function Repository Resource:

# CarlemanMatrix

Evaluate the Carleman matrix of a function

Contributed by: Jan Mangaldan
 ResourceFunction["CarlemanMatrix"][f,{x,x0,{m,n}}] gives the order {m,n} Carleman matrix of f about the point x=x0. ResourceFunction["CarlemanMatrix"][f,{x,x0,n}] gives the order n Carleman matrix of f about the point x=x0.

## Details

The Carleman matrix of an infinitely differentiable function f(x) has elements .
The Carleman matrix about the point x=x0 is defined only when there is a corresponding power series at that point.
The order {m,n} Carleman matrix has dimensions (m+1)×(n+1).

## Examples

### Basic Examples (1)

A Carleman matrix of order {2,3} for Exp[x]:

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### Scope (2)

Carleman matrix of an arbitrary function:

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Carleman matrix with a complex-valued expansion point:

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### Properties and Relations (3)

The kth row of the Carleman matrix of f(x) corresponds to the power series coefficients of :

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If f(0)=0, the second row of the nth matrix power of the Carleman matrix of f(x) corresponds to the power series coefficients of the nth composition of f(x):

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If f(0)=0, the second row of the inverse of the Carleman matrix of f(x) corresponds to the power series coefficients of :

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## Version History

• 1.0.0 – 04 March 2021