Dt
 Usage
• Dt[f, x] gives the total derivative  .
• Dt[f] gives the total differential  .
• Dt[f, {x, n}] gives the multiple derivative  .
• Dt[f,  ,  , ... ] gives  .
Notes
• Dt[f,  , ... , Constants -> { , ... }] specifies that the  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  . • Example: Dt[x y]  . • You can specify total derivatives by assigning values to Dt[f], etc. • New in Version 1.
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