# Dt

Dt[f,x]

gives the total derivative df/dx.

Dt[f]

gives the total differential df.

Dt[f,{x,n}]

gives the multiple derivative dnf/dxn.

Dt[f,x1,x2,]

gives d/dx1 d/dx2 f.

# Details and Options • Dt[f,x1,,Constants->{c1,}] specifies that the ci are constants, which have zero total derivative.
• Symbols with attribute Constant are taken to be constants, with zero total derivative.
• If an object is specified to be a constant, then all functions with that object as a head are also taken to be constants.
• All quantities not explicitly specified as constants are assumed to depend on the xi.
• You can specify total derivatives by assigning values to Dt[f], etc.

# Examples

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## Basic Examples(4)

Find the total derivative with respect to :

 In:= Out= Find the total differential of :

 In:= Out= Find the second total derivative with respect to :

 In:= Out= Find the total derivative with respect to two variables:

 In:= Out= ## Properties & Relations(1)

Introduced in 1988
(1.0)