Moment map

Layer 0 — Mathematicsin the symplectic-geometry subtree

Equivariant map μ: M → g* for a Hamiltonian G-action, characterised by d⟨μ,X⟩ = ι_{X_M}ω for every X ∈ g. Enables symplectic reduction M//G = μ⁻¹(0)/G, generalising quotient by symmetry.

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