We derive by analytic means a number of bilateral identities of the
Rogers-Ramanujan type. Our results include bilateral extensions of the
Rogers-Ramanujan and the G\"ollnitz-Gordon identities, and of related
identities by Ramanujan, Jackson, and Slater. We give corresponding results for
multiseries including multilateral extensions of the Andrews-Gordon identities,
of Bressoud's even modulus identities, and other identities. The here revealed
closed form bilateral and multilateral summations appear to be the very first
of their kind. Given that the classical Rogers-Ramanujan identities have
well-established connections to various areas in mathematics and in physics, it
is natural to expect that the new bilateral and multilateral identities can be
similarly connected to those areas. This is supported by concrete combinatorial
interpretations for a collection of four bilateral companions to the classical
Rogers-Ramanujan identities.Comment: 25 page