Inexact Differential
An infinitesimal which is not the differential of an actual function and which cannot be expressed as
the way an Exact Differential can. Inexact differentials are denoted with a bar through the
. The most commonexample of an inexact differential is the change in heat 
encountered inthermodynamics. See also Exact Differential, Pfaffian Form
References
Zemansky, M. W. Heat and Thermodynamics, 5th ed. New York: McGraw-Hill, p. 38, 1968.
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