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DEtools[MultiplicativeDecomposition] - construct two multiplicative decompositions of a hyperexponential function
Calling Sequence
MultiplicativeDecomposition[1](H, x)
MultiplicativeDecomposition[2](H, x)
Parameters
H
-
hyperexponential function of x
x
variable
Description
Let H be a hyperexponential function of x over a field K of characteristic 0. The MultiplicativeDecomposition[i](H,x) calling sequence constructs the ith multiplicative decomposition for H, .
If the MultiplicativeDecomposition command is called without an index, the first multiplicative decomposition is constructed.
A multiplicative decomposition of H is a pair of rational functions such that . Let R be the rational certificate of H, i.e., . Let be a differential rational normal form of R. Then is a multiplicative decomposition of H. Hence, each differential rational normal form of the certificate R of H is also a multiplicative decomposition of H.
The construction of MultiplicativeDecomposition[i](H,x) is based on , for .
The output is of the form where V and F are rational function of x over K.
Examples
See Also
DEtools[AreSimilar], DEtools[RationalCanonicalForm], DEtools[ReduceHyperexp], SumTools[Hypergeometric][MultiplicativeDecomposition]
References
Geddes, Keith; Le, Ha; and Li, Ziming. "Differential rational canonical forms and a reduction algorithm for hyperexponential functions." Proceedings of ISSAC 2004. ACM Press, (2004): 183-190.
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