List questions from calculus-of-variations

Published on 27 Mar 2026 - 4:23

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Change of coordinates in Lagrangian - solution query

Published on 29 Mar 2026 - 5:11

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How did $\sqrt{\frac{\mathrm d\mathbf r}{\mathrm d s}\cdot \frac{\mathrm d\mathbf r}{\mathrm ds}}$ come in the variation of the action $\mathrm A$?

Published on 25 Dec 2016 - 14:43

33

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Equivalence of the variation of action under the re-parametrization of the curve.

Published on 26 Dec 2016 - 3:56

101

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Derivative of $\sqrt{\mathbf {\dot r}\cdot \mathbf{\dot r}}$ with respect to $\mathbf{\dot r}$.

Published on 29 Dec 2016 - 4:17

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Functional differential equation (from Quantum Field Theory).

Published on 23 Feb 2026 - 13:40

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Singular integral equation calculus of variation kernel

Published on 02 Jan 2017 - 5:44

785

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Distinction or rule about $d$ and $\delta$ in differential forms

Published on 04 Jan 2017 - 4:22

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Differentiating a function of a variable with respect to the variable's derivative

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442

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Calculus of Variation to get Least Squares

Published on 06 Jan 2017 - 13:00

829

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Derivative with respect to a function under integral in calculus of variations (partial derivation)

Published on 07 Jan 2017 - 13:01

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Calculus of variations, interpreting the minimum in first order

Published on 31 Mar 2026 - 3:30

47

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Missing term in variational calculus problem

Published on 09 Jan 2017 - 21:14

280

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How to take the derivative of this function?

Published on 27 Mar 2026 - 4:16

407

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Solving Euler-Lagrange when there is no $y'(x)$ in functional

Published on 27 Mar 2026 - 4:22

List Question

Proof of two equalities from the Calculus of Variations

Change of coordinates in Lagrangian - solution query

How did $\sqrt{\frac{\mathrm d\mathbf r}{\mathrm d s}\cdot \frac{\mathrm d\mathbf r}{\mathrm ds}}$ come in the variation of the action $\mathrm A$?

Equivalence of the variation of action under the re-parametrization of the curve.

Derivative of $\sqrt{\mathbf {\dot r}\cdot \mathbf{\dot r}}$ with respect to $\mathbf{\dot r}$.

Functional differential equation (from Quantum Field Theory).

Singular integral equation calculus of variation kernel

Distinction or rule about $d$ and $\delta$ in differential forms

Differentiating a function of a variable with respect to the variable's derivative

Calculus of Variation to get Least Squares

Derivative with respect to a function under integral in calculus of variations (partial derivation)

Calculus of variations, interpreting the minimum in first order

Missing term in variational calculus problem

How to take the derivative of this function?

Solving Euler-Lagrange when there is no $y'(x)$ in functional

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