Question

Mdx+Ndy=0
is an exact differential equation if partial derivative of M wrt y=partial derivative of N wrt x.
so what is the physical meaning of exact differential equation?

Answer 1

i believe it means you can use a certain way to solve it if someone says it is exact

Answer 2

http://en.wikipedia.org/wiki/Exact_differential_equation

Answer 3

but what are the special properties of an exact d.e. why do you call it 'exact'?

Answer 4

i never asked that question before so i don't know why people call it that