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Ore_algebra[Ore_to_diff] - convert a differential operator to a differential equation
Ore_algebra[Ore_to_shift] - convert a shift operator to a recurrence equation
Ore_algebra[Ore_to_DESol] - convert a differential operator to a DESol structure
Ore_algebra[Ore_to_RESol] - convert a shift operator to an RESol structure
Calling Sequence
Ore_to_diff(G, f, A)
Ore_to_diff(G, f, A, 'D')
Ore_to_shift(G, u, A)
Ore_to_shift(G, u, A, 'indexed')
Ore_to_DESol(P, f, A)
Ore_to_RESol(P, u, A)
Parameters
G
-
list of operators of the Ore algebra A
P
operator of the Ore algebra A
f
expression denoting a mathematical function
A
Ore algebra table
Description
The Ore_to_diff command converts a differential operator or a list of differential operators of the skew algebra A into a differential equation or a list of differential equations in the function f. The output is expressed in terms of the diff function by default, or in terms of the D function when the optional parameter is set.
The Ore_to_DESol command converts a single differential operator of the skew algebra A into a DESol structure in the function f.
The Ore_to_shift command converts a shift operator or a list of shift operators of the skew algebra A into a recurrence equation or a list of recurrence equations in the sequence u. The output is expressed in functional notation ( ) by default, or in the indexed notation ( ) when the optional argument is set.
The Ore_to_RESol command converts a single recurrence operator of the skew algebra A into an RESol structure in the sequence u.
Examples
Differential case.
Euler case.
Recurrence case.
Multivariate differential case.
These are operators for BesselJ(mu,x*y^2).
No conversion is available to a multivariate DESol.
Error, invalid input: Ore_algebra:-Ore_to_DESol expects its 1st argument, poly, to be of type polynom, but received [-2*x*Dx+Dy*y, -4*(mu-x*y^2)*(mu+x*y^2)+2*x*Dx+y^2*Dy^2, -2*(mu-x*y^2)*(mu+x*y^2)+Dy*Dx*y*x, -(mu-x*y^2)*(mu+x*y^2)+x*Dx+x^2*Dx^2]
See Also
Ore_algebra, Ore_algebra/applyopr, Ore_algebra/skew_algebra
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