BUILT-IN MATHEMATICA SYMBOL

# DifferenceDelta

DifferenceDelta[f, i]
gives the discrete difference .

DifferenceDelta[f, {i, n}]
gives the multiple difference .

DifferenceDelta[f, {i, n, h}]
gives the multiple difference with step h.

DifferenceDelta[f, i, j, ...]
computes the partial difference with respect to .

## Details and OptionsDetails and Options

• DifferenceDelta[f, i] can be input as . The character is entered EscdiffdEsc or \[DifferenceDelta]. The variable i is entered as a subscript.
• All quantities that do not explicitly depend on the variables given are taken to have zero partial difference.
• DifferenceDelta[f, i, j] can be input as . The character \[InvisibleComma], entered as Esc,Esc, can be used instead of the ordinary comma.
• DifferenceDelta[f, {i, n, h}] can be input as .
• DifferenceDelta[f, ..., Assumptions->assum] uses the assumptions assum in the course of computing discrete differences.

## ExamplesExamplesopen allclose all

### Basic Examples (4)Basic Examples (4)

Difference with respect to i:

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Difference with step h:

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The fifth difference with respect to i:

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The second difference with respect to i and step h:

 Out[2]=

Enter using EscdiffdEsc, and subscripts using Ctrl+_:

 Out[1]=

DifferenceDelta is the inverse operator to Sum:

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 Out[2]=