Is this constraint nonholonomic or not?

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SUMMARY

The discussion confirms that the classification of a constraint as nonholonomic depends on the specific function involved. A nonholonomic constraint includes terms of velocity and is non-integrable, while a holonomic constraint does not depend on the path taken. The equation presented, particularly when considering the function f, illustrates this distinction: if f equals dot x, the constraint is holonomic; if f equals dot x plus y dot z, the constraint is nonholonomic. The redundancy of the second part of the constraint is noted, as it follows from the first.

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I really want to know whether this equation is nonholonomic or not.

(As far as I know, Nonholonomic constraint has a term of velocity and do non-integrable. But this formula does not dependent on a path, because it is a total differential form.)
 
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It is nonholonomic, for the reason you gave. Note that the second part of the constraint ##df=\frac{\partial f}{\partial q}dq + \frac{\partial f}{\partial q'}dq'+\frac{\partial f}{\partial t}dt=0## is redundant, as it follows from the first constraint.
 
Sorry for digging up old story but the correct answer on OP's question is as follows: it depends on the function ##f##. For example, if ##f=\dot x## then the constraint is holonomic; if ##f=\dot x+y\dot z## the the constraint is nonholonomic.
 

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