Beltrami identity
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The Beltrami identity, named after Eugenio Beltrami, is a special case of the Euler–Lagrange equation in the calculus of variations.
A chain hanging from points forms a catenary.
Eugenio Beltrami
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Eugenio Beltrami was an Italian mathematician notable for his work concerning differential geometry and mathematical physics. His work was noted especially for clarity of exposition. He was the first
Beltrami identity
…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…
Eugenio Beltrami
Sulla teoria dell'induzione magnetica secondo Poisson, 1884