proof ch:14-calculus-of-variations@proof-49

open in the book · parts/02-mathematical-methods/14-calculus-of-variations.tex:3302

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proof : ch:14-calculus-of-variations@proof-49prooftheorem 16.104: Snell's law of refraction16.104definition 16.103: Optical path length; Fermat's principle16.103lemma 7.33: Fermat: interior extremum7.33

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proves Snell's law of refraction declared parts/02-mathematical-methods/14-calculus-of-variations.tex:3302