Narain, K. S.Sarmadi, M. H.Vafa, C.2019-09-221991Narain, K.S., M.H. Sarmadi, and C. Vafa. 1991. “Asymmetric Orbifolds: Path Integral and Operator Formulations.” Nuclear Physics B 356 (1): 163–207. https://doi.org/10.1016/0550-3213(91)90145-n.0169-68230550-32131873-1562http://nrs.harvard.edu/urn-3:HUL.InstRepos:41385049We discuss some of the details involved in asymmetric orbifold construction. In particular, the path-integral formalism is developed and shown to be consistent with operator interpretation. Conditions of one-loop modular invariance are discussed in detail. We also describe how one can construct correlation functions involving twisted states.en-USJournal Article2019-09-2210.1016/0550-3213(91)90145-N