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The canonical structure of supergravity with a cosmological constant isanalyzed in 2 + 1 dimensions using the Dirac constraint formalism. The firstclass constraints are used to find two Bosonic and one Fermionic gaugesymmetries that satisfy a superalgebra. Provided the cosmological constant isnegative, this novel algebra closes, without having to invoke the equations ofmotion or introducing auxiliary fields.

Derivation of Gauge Symmetries in Supergravity with a Cosmological Constant in 2 + 1 Dimensions