There are times, however, when we are more interested in finding the function from which the potx
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(A34)
2
c
P
nRT
P
dP
nRT +=−
∫
7/10/07 A- 131
There are times, however, when we are more interested in finding the function from which
the integrand came (i.e., finding the antiderivative) than in finding the actual change. Then we
must recognize that the derivative of a constant is zero, so any arbitrary constant added to the
integral vanishes in finding the integrand. Thus we may write
where c is an arbitrary, or unknown, constant. Such an expression is called an indefinite integral.
