I'm curious about Euler Lagrange equation. $$d/dx(dF/dy') - dF/dy.$$ $y=y(x)$ why when we partial derivative $dF/dy'$ we don't need to consider $x$ or $y$? like $dF/dx * dx/dy'$
2026-03-30 00:16:26.1774829786
Euler-Lagrange equation partial derivative
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