Exact and Inexact Differential

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SUMMARY

The discussion centers on determining whether the expression (x² - y)dx + xdy represents an exact differential. An exact differential is defined as a form that can be expressed as dF, where the condition ∂M/∂y = ∂N/∂x must hold true without exceptions. In this case, the participants clarify that the left-hand side must correspond to d(something) and provide an example of an exact differential, y²cos(x)dx + 2ysin(x)dy, to illustrate the concept.

PREREQUISITES
  • Understanding of differential forms
  • Knowledge of partial derivatives
  • Familiarity with the concept of exact differentials
  • Basic calculus principles
NEXT STEPS
  • Study the conditions for exact differentials in detail
  • Learn about inexact differentials and their applications
  • Explore the implications of path dependence in thermodynamics
  • Review examples of exact and inexact differentials in calculus
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Students and educators in mathematics and physics, particularly those studying calculus and differential equations, will benefit from this discussion.

FourierX
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Homework Statement



Is (x2 -y)dx + xdy = dF an exact differential ?

dF = path dependent ( i.e. d has a line strikethrough it as h in Planck's constant.)


Homework Equations



(x2 -y)dx + xdy = dF

The Attempt at a Solution



I don't know what exact and inexact differentials are. Please help me.
 
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Hi FourierX! :smile:

Exact differential means that the left hand side is exactly d(something), for example y2cosxdx + 2ysinxdy is an exact differential because it is d(y2sinx)
 
Mdx + Ndy = f(x) is exact only when this condition is met \frac{\partial M}{\partial y} = \frac{\partial N}{\partial x} (It has to be EXACTLY equal...no minus signs allowed etc..)
 

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