 Sectional curvature

ID: sectional-curvature

Codex  0 Created 2026-09-24 Updated 2026-09-24

σ = span (X, Y)

in a Riemannian tangent space,

K (σ) = \frac{⟨ R ( X , Y ) Y , X ⟩}{∣ X ∣ ^{2} ∣ Y ∣ ^{2} - ⟨ X , Y ⟩ ^{2}} .

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