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Slode

  

hypergeom_series_sol

  

formal power series solutions with hypergeometric coefficients for a linear ODE

 

Calling Sequence

Parameters

Description

Options

Examples

Calling Sequence

hypergeom_series_sol(ode, var,opts)

hypergeom_series_sol(LODEstr,opts)

Parameters

ode

-

linear ODE with polynomial coefficients

var

-

dependent variable, for example y(x)

opts

-

optional arguments of the form keyword=value

LODEstr

-

LODEstruct data structure

Description

• 

The hypergeom_series_sol command returns one formal power series solution or a set of formal power series solutions of the given linear ordinary differential equation with polynomial coefficients. The ODE must be either homogeneous or inhomogeneous with a right-hand side that is a polynomial, a rational function, or a "nice" power series (see LODEstruct) in the independent variable .

• 

If ode is an expression, then it is equated to zero.

• 

The command returns an error message if the differential equation ode does not satisfy the following conditions.

– 

ode must be linear in var

– 

ode must be homogeneous or have a right-hand side that is rational or a "nice" power series in

– 

The coefficients of ode must be polynomial in the independent variable of var, for example, , over the rational number field which can be extended by one or more parameters.

• 

A homogeneous linear ordinary differential equation with coefficients that are polynomials in  has a linear space of formal power series solutions  where  is one of , , , or ,  is the expansion point, and the sequence  satisfies a homogeneous linear recurrence. In the case of an inhomogeneous equation with a right-hand side that is a "nice" power series,  satisfies an inhomogeneous linear recurrence.

• 

The command selects such formal power series solutions where  for all sufficiently large , where  is a rational function.

• 

This command determines an integer  such that  can be represented in the form of hypergeometric term (see SumTools[Hypergeometric],LREtools):

  

for all .

Options

• 

x=a or 'point'=a

  

Specifies the expansion point in the case of a homogeneous equation or an inhomogeneous equation with rational right-hand side. It can be an algebraic number, depending rationally on some parameters, or . In the case of a "nice" series right-hand side the expansion point is given by the right-hand side and cannot be changed.

  

If this option is given, then the command returns one formal power series solution at a with hypergeometric coefficients if it exists; otherwise, it returns NULL. If a is not given, it returns a set of formal power series solutions with hypergeometric coefficients for all possible points that are determined by Slode[candidate_points](ode,var,'type'='hypergeometric').

• 

'free'=C

  

Specifies a base name C to use for free variables C[0], C[1], etc. The default is the global name  _C. Note that the number of free variables may be less than the order of the given equation.

• 

'indices'=[n,k]

  

Specifies names for dummy variables. The default values are the global names _n and _k. The name n is used as the summation index in the power series. The name k is used as the product index in ( * ).

• 

'outputHGT'=name

  

Specifies the form of representation of hypergeometric terms.  The default value is 'active'.

– 

'inert' - the hypergeometric term ( * ) is represented by an inert product, except for , which is simplified to .

– 

'rcf1' or 'rcf2' - the hypergeometric term is represented in the first or second minimal representation, respectively (see ConjugateRTerm).

– 

'active' - the hypergeometric term is represented by non-inert products which, if possible, are computed (see product).

Examples

(1)

(2)

(3)

(4)

Inhomogeneous equations are handled:

(5)

(6)

See Also

LODEstruct

Slode

Slode[candidate_points]

Slode[mhypergeom_series_sol]

Slode[polynomial_series_sol]

Slode[rational_series_sol]

 


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