Noether's theorem and EL equations for $\int_a^b L\left(x(t),u(t),\frac{u_t}{x_t},\frac{1}{x_t}\frac{d}{dt}\left[\frac{u_t}{x_t}\right]\right)x_t\,dt$

score 143 · Answer 10 · 2026-04-11 18:48:13

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I have a problem solving an Isoperimetric Question using Euler-Lagrange

Published on 11 Apr 2026 - 18:48

score 72 · Answer 11 · 2026-03-29 20:52:53

72

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$-\int_{X} \log(|\det(\nabla \phi_{t})|) d\mu \rightarrow max$ variational problem with differential constraints

Published on 29 Mar 2026 - 20:52

score 61 · Answer 12 · 2026-04-12 16:28:07

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Need help with an Isoperimetric Problem. Am I doing the correct steps? What am I doing wrong?

Published on 12 Apr 2026 - 16:28

score 41 · Answer 13 · 2026-04-12 18:31:47

41

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How to minimise light propagation time in a spherical mirror?

Published on 12 Apr 2026 - 18:31

score 79 · Answer 14 · 2026-03-29 04:43:57

79

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Timoshenko beam coercivity: $A((w,\beta),(v,\eta)):=\int^1_0\beta'\eta'dx+\int^1_0(w'-\beta)(v'-\eta)dx=\int^1_0fvdx \forall(v,\eta)\in H^1_0(0,1)^2$

Published on 29 Mar 2026 - 4:43

score 49 · Answer 15 · 2022-06-13 11:03:29

49

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Why is $f_t= \gamma^{'}_s$?

Published on 13 Jun 2022 - 11:03

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Noether's theorem and EL equations for $\int_a^b L\left(x(t),u(t),\frac{u_t}{x_t},\frac{1}{x_t}\frac{d}{dt}\left[\frac{u_t}{x_t}\right]\right)x_t\,dt$

I have a problem solving an Isoperimetric Question using Euler-Lagrange

$-\int_{X} \log(|\det(\nabla \phi_{t})|) d\mu \rightarrow max$ variational problem with differential constraints

Need help with an Isoperimetric Problem. Am I doing the correct steps? What am I doing wrong?

How to minimise light propagation time in a spherical mirror?

Timoshenko beam coercivity: $A((w,\beta),(v,\eta)):=\int^1_0\beta'\eta'dx+\int^1_0(w'-\beta)(v'-\eta)dx=\int^1_0fvdx \forall(v,\eta)\in H^1_0(0,1)^2$

Why is $f_t= \gamma^{'}_s$?

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