Higher Order Logic. A proof-generating system for higher order logic based on LCF . Implementations include HOL-88 and HOL-90 .
ftp://ted.cs.uidaho.edu/pub/hol . Mailing list: info-hol@ted.cs.uidaho.edu.
["HOL: A Machine Oriented Formulation of Higher Order Logic", M.J.C. Gordon, Report 68, Comp Lab U Cambridge (1985)].
["Introduction to HOL", M.J.C. Gordon et al, Cambridge U Press 1993 ISBN 0-521-441897].