page_title: Beltrami identity
hierarchical_section_title: Beltrami identity
context_page_description: The Beltrami identity, named after Eugenio Beltrami, is a special case of the Euler–Lagrange equation in the calculus of variations.
  The Euler–Lagrange equation serves to extremize action functionals of the form
  where and are constants and.
  If, then the Euler–Lagrange equation reduces to the Beltrami identity,
  where C is a constant.
context_section_description: The Beltrami identity, named after Eugenio Beltrami, is a special case of the Euler–Lagrange equation in the calculus of variations.
  The Euler–Lagrange equation serves to extremize action functionals of the form 
  where  and  are constants and .
  If , then the Euler–Lagrange equation reduces to the Beltrami identity,
  where C is a constant.
caption: Eugenio Beltrami
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