można otrzymać z równań Euler–Lagrange postaci<ref name="Courant">{{cite book|last1=Courant|first1=R|authorlink1=Richard Courant|last2=Hilbert|first2=D|authorlink2=David Hilbert|title=Methods of Mathematical Physics|volume=Vol. I|edition=First English|ref=harv|publisher=Interscience Publishers, Inc|year=1953|location=New York|isbn=978-0471504474}}</ref>
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Równania Euler–Lagrange mają postać
Równania Euler–Lagrange mają postać<ref name="Weinstock">{{cite book|last=Weinstock|first=R.|year=1952|title=Calculus of Variations with Applications to Physics and Engineering|publisher=McGraw-Hill|location=New York}}</ref>
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to układ równań Eulera-Lagrange'a ma postać
to układ równań Eulera-Lagrange'a ma postać<ref name="Courant2">{{cite book|last1=Courant|first1=R|authorlink1=Richard Courant|last2=Hilbert|first2=D|authorlink2=David Hilbert|title=Methods of Mathematical Physics|volume=Vol. I|edition=First English|ref=harv|publisher=Interscience Publishers, Inc|year=1953|location=New York|isbn=978-0471504474}}</ref>
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to równanie Eulera-Lagrange'a ma postać
to równanie Eulera-Lagrange'a ma postać<ref name="Courant4">{{cite book|last1=Courant|first1=R|authorlink1=Richard Courant|last2=Hilbert|first2=D|authorlink2=David Hilbert|title=Methods of Mathematical Physics|volume=Vol. I|edition=First English|ref=harv|publisher=Interscience Publishers, Inc|year=1953|location=New York|isbn=978-0471504474}}</ref>
