Talk:Strain-rate tensor

Proposed merge with Velocity gradient
Low-quality duplicate. Quinton Feldberg (talk) 17:44, 17 October 2017 (UTC)
 * ✅ Klbrain (talk) 19:52, 31 March 2019 (UTC)

Doubt
Hi, why is L defined like transpose of nabla v? I find the definition without transpose more standard and common. A.j.rimmer.bdzp (talk) 13:57, 13 October 2020 (UTC)


 * I can't believe nobody fixed this in so long. The component definition should be correct now. Adigitoleo (talk) 08:10, 10 May 2023 (UTC)
 * You made the definitions within the article inconsistent (see definition of J in section Formal definition)
 * The reason nobody touches this is likely, that physicists do not manage to agree what \nabla u means.
 * Mathematically \nabla u_ij = \nabla_i u_j is more sensible, but its transpose is more widely used in physics.
 * Several pages within Wikipedia containing such derivatives get edits based on “the indices seem odd”.
 * There should probably be an explanation regarding the indices to avoid something like that.
 * Also, please keep the article consistent. Richardk2n (talk) 12:46, 23 January 2024 (UTC)
 * Oops, I've reverted it for now. I checked a recent-ish physics textbook (2015) and indeed they use the transposed definition. I wasn't familiar with it but if it is common across other pages then we can keep it consistent. I may add some comments about the ambiguity in this definition later if I get a chance. Adigitoleo (talk) 23:06, 23 January 2024 (UTC)