In differential geometry, a G 2 {\displaystyle G_{2}} -structure is an important type of G-structure that can be defined on a smooth manifold. If M is a smooth manifold of dimension seven, then a G2-structure is a reduction of structure group of the frame bundle of M to the compact, exceptional Lie group G2.
In differential geometry, a G 2 {\displaystyle G_{2}} -structure is an important type of G-structure that can be defined on a smooth manifold. If M is a smooth manifold of dimension seven, then a G2-structure is a reduction of structure group of the frame bundle of M to the compact, exceptional Lie group G2.
Source: Wikipedia "G2-structure" · CC BY-SA 4.0
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