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

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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..
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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
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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.
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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.
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