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Making sense of the Legendre transform
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Abstract

The Legendre transform is a powerful tool in theoretical physics and plays an important role in classical mechanics,statistical mechanics, and thermodynamics. In typical undergraduate and graduate courses the motivation and elegance of the method are often missing, unlike the treatments frequently enjoyed by Fourier transforms. We review and modify the presentation of Legendre transforms in a way that explicates the formal mathematics, resulting in manifestly symmetric equations, thereby clarifying the structure of the transform. We then discuss examples to motivate the transform as a way of choosing independent variables that are more easily controlled. We demonstrate how the Legendre transform arises naturally from statistical mechanics and show how the use of dimensionless thermodynamic potentials leads to more natural and symmetric relations.

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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Making sense of the Legendre transform
http://aip.metastore.ingenta.com/content/aapt/journal/ajp/77/7/10.1119/1.3119512
10.1119/1.3119512
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