Macdonald identities
In mathematics, the Macdonald identities are some infinite product identities associated to affine root systems, introduced by. They include as special cases the Jacobi triple [product identity], Watson's quintuple product identity, several identities found by, and a 10-fold product identity found by.
and pointed out that the Macdonald identities are the analogs of the Weyl denominator formula for affine Kac–Moody algebras and superalgebras.