f(t) gravity 2teleparallel gravity 2anisotropic cosmology 1charged black holes 1electromagnetic fields 1kantowski-sachs cosmology 1reconstruction methods 1static spherically symmetric solutions 1wormholes 1
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math.CT2026
Doubly weak double categories
Aaron David Fairbanks, Michael Shulman
We propose a definition of double categories whose composition of 1-cells is weak in both directions. Namely, a doubly weak double category is a double computad -- a structure with…
math.CT2026
Multivariate functorial difference
Robert Paré
Partial difference operators for a large class of functors between presheaf categories are introduced, extending our difference operator from \cite{Par24} to the multivariable case…