Macdonald identities
In mathematics, the Macdonald identities are some infinite product identities associated to affine [root system]s, 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.