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Lie Bracket

Source lecture(s): PHY622 Lec10

Physical Meaning

Measures non-commutativity of infinitesimal generators.

Variable Definitions

Symbol Meaning
\(T_a\) generators
\(f_{abc}\) structure constants

Assumptions

Smooth manifold, flows near identity.

Derivation

Consider \([X,Y]=XY-YX\); at identity the commutator of vector fields yields the Lie bracket.

Applications

Quantum mechanics (commutators), gauge theory, robotics.

Connections to Other Equations

  • lie-groups
  • group-representations