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Curly braces around two operators separated by a comma.
Also known as: Anticommutator, Curly bracket commutator, Jordan product
The anticommutator is AB plus BA, and swapping square brackets for curly braces is the entire notational difference from the commutator. It is the operation that fermions obey, which is why the shape of the bracket in a physics paper tells you which kind of particle is being discussed.
Denotes the anticommutator of two operators: their product taken in both orders and summed.
Contexts: Mathematics
Governs fermionic operators, where the anticommutator rather than the commutator is the canonical relation, and hence encodes the Pauli exclusion principle.
Contexts: Mathematics
A pair of curly braces, each a curved stroke with a central point, enclosing two names separated by a comma.