可卡 发表于 2025-3-23 10:28:34
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https://doi.org/10.1007/978-3-662-62635-1s non-uniform, however, the material groupoid is generally not differentiable. In such cases, the analysis can be based on a new differential geometric construct called the material distribution, to which we can associate other physically meaningful objects, such as a material foliation, with the hedoxazosin 发表于 2025-3-23 23:16:45
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De Donder Construction for Higher Jetsresulting forms may depend on the coordinate system used. Nevertheless, it leads to many invariant conclusions. In some cases, like second order gravity, the construction leads to a unique De Donder form on the jet bundle that is independent of the choice of coordinates.meditation 发表于 2025-3-24 09:38:00
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