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QDifferenceEquations[QEfficientRepresentation] - construct the four efficient representations of a q-hypergeometric term
Calling Sequence
QEfficientRepresentation[1](H, q, n)
QEfficientRepresentation[2](H, q, n)
QEfficientRepresentation[3](H, q, n)
QEfficientRepresentation[4](H, q, n)
Parameters
H
-
q-hypergeometric term in q^n
q
name used as the parameter q, usually q
n
variable
Description
Let H be a q-hypergeometric term in . The QEfficientRepresentation[i](H,q,n) command constructs the ith efficient representation of H of the form where , are constant and is a product of QPochhammer-function values and their reciprocals. Additionally,
has the minimal number of factors,
is a rational function which is minimal in one sense or another, depending on the particular q-rational canonical form chosen to represent the certificate of .
If then is minimal; if then is minimal; if then is minimal, and under this condition, is minimal; if then is minimal, and under this condition, is minimal.
If QEfficientRepresentation is called without an index, the first efficient representation is constructed.
Examples
See Also
QDifferenceEquations[QMultiplicativeDecomposition], QDifferenceEquations[QObjects], QDifferenceEquations[QRationalCanonicalForm], QDifferenceEquations[RegularQPochhammerForm]
References
Abramov, S.A.; Le, H.Q.; and Petkovsek, M. "Efficient Representations of (q-)Hypergeometric Terms and the Assignment Problem." Submitted.
Abramov, S.A.; Le, H.Q.; and Petkovsek, M. "Rational Canonical Forms and Efficient Representations of Hypergeometric Terms." Proc. ISSAC'2003, pp. 7-14. 2003.
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