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D
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Constants

Constants
is an option for Dt which gives a list of objects to be taken as constants.
  • If f appears in the list of Constants, then both Dt[f] and Dt are taken to be zero.
Here both a and b are assumed to depend on x:
Specify that a does not depend on x using the Constants option:
Specify that both a and b are independent of x:
Here both a and b are assumed to depend on x:
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Specify that a does not depend on x using the Constants option:
In[1]:=
Click for copyable input
Out[1]=
 
Specify that both a and b are independent of x:
In[1]:=
Click for copyable input
Out[1]=
Use TagSet to prescribe a constant:
Use SetAttributes to prescribe a constant:
For a constant f any expression is also assumed to be constant:
Constants allows Dt to emulate D:
NonConstants allows D to emulate Dt:
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