谷物 发表于 2025-3-23 11:28:31

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青春期 发表于 2025-3-23 16:06:11

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玩忽职守 发表于 2025-3-23 18:46:32

Kollineare und reziproke Verwandtschaft,se classes can betransferred into one another if we renumber the foliations according to a parastrophytransformation of the coordinate quasigroup of a web. This allows us to study onlyone of these three classes, for example, the middle Bol webs B..

Tincture 发表于 2025-3-24 01:54:06

Einführung in die Angewandte Linguistik Section 1.1.We noted there that a .-structure . in a smooth manifold . of dimension . isa subbundle of the frame bundle .(.), with the same base . as .(.), which isdefined by a Lie group . - a subgroup of the general linear group .(.). Thissubbundle can be given by differential equations (1.8). If

CHOKE 发表于 2025-3-24 04:30:20

Einführung in die Angewandte Mineralogie3, are calledisotopic if there exists a triple . = (., . , . ) of bijective mappings . : . → .such that, for any . ∈ . and any . ∈ ., the relation .(.) o .(.) = .(. ⋅ .). holds. An isotopic mapping of a quasigroup onto itself is called an autotopy.

invert 发表于 2025-3-24 10:05:16

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说不出 发表于 2025-3-24 11:37:35

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Charitable 发表于 2025-3-24 17:27:31

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诗集 发表于 2025-3-24 20:28:48

Einführung in die Angewandte Mineralogie3, are calledisotopic if there exists a triple . = (., . , . ) of bijective mappings . : . → .such that, for any . ∈ . and any . ∈ ., the relation .(.) o .(.) = .(. ⋅ .). holds. An isotopic mapping of a quasigroup onto itself is called an autotopy.

Bph773 发表于 2025-3-25 00:45:13

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查看完整版本: Titlebook: Geometry and Algebra of Multidimensional Three-Webs; Maks A. Akivis,Alexander M. Shelekhov Book 1992 Springer Science+Business Media Dordr