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 1h revised Do any approaches to a TOE expect to provide a unique solution to the universe? edited tags 2h comment Questions about null geodesic 2h reviewed Leave Closed How can there be an infinite number of universes? 2h revised Spread of gases in a room edited tags 2h comment Is there a 3D analogue of angle? Would Mathematics be a better home for this question? 2h revised A 50 g Ice Cube with an initial temperature of -10°C is put in 400 g of water at 40°C. Find final temperature edited tags 2h comment Two-point function of a free massless scalar field in Euclidean space-time Crossposted to mathoverflow.net/q/237647/13917 3h revised Expectation value using Functional Derivatives edited tags 4h comment Can we embed 2+1 space-time of GR in a 3 Dimensional Euclidean space? To reopen this question (v1) consider 1. clarifying your definition of Euclidean space, and 2. harmonize title question and question in main body (3D vs. 4D). 4h revised Deriving the speed of the propagation of a change in the Electromagnetic Field from Maxwell's Equations added 8 characters in body; edited tags 4h revised Antiparticles, charge conjugation and chirality edited tags 4h revised Lagrangian for relativistic massless point particle Changed from SR to GR to be more general 4h revised Lagrangian for relativistic massless point particle Changed from SR to GR to be more general 5h comment How can I prove that the Euler-Bernoulli beam PDE is Hamiltonian? @AccidentalFourierTransform: Ups. Thx. Corrected. 5h comment How can I prove that the Euler-Bernoulli beam PDE is Hamiltonian? Hint: The corresponding Lagrangian density is ${\cal L}=\frac{1}{2}u^2_t - \frac{1}{2} u_{xx}^2 - F(x,u)$. 5h revised How can I prove that the Euler-Bernoulli beam PDE is Hamiltonian? added 148 characters in body; edited tags; edited title 5h revised Rotation of a vector added 2 characters in body; edited tags 6h revised How does change in medium affect object distance/image distance? edited tags 6h revised Net force equal to mass multiplied by acceleration of centre of mass edited tags; edited title 6h revised EM: Maxwell relations, waves deleted 24 characters in body; edited tags