Integral geometry under G₂ and Spin(7)
classification
🧮 math.DG
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spingroupsinvariantalgebraalgebrasbasescomputedconstructed
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A Hadwiger-type theorem for the exceptional Lie groups $G_2$ and $Spin(7)$ is proved. The algebras of $G_2$ or $Spin(7)$ invariant, translation invariant continuous valuations are both of dimension 10. Geometrically meaningful bases are constructed and the algebra structures are computed. Finally, the kinematic formulas for these groups are determined.
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