套件：hol88-library（2.02.19940316dfsg-5 以及其他的） [debports]
Higher Order Logic, binary library modules
The HOL System is an environment for interactive theorem proving in a higher-order logic. Its most outstanding feature is its high degree of programmability through the meta-language ML. The system has a wide variety of uses from formalizing pure mathematics to verification of industrial hardware. Academic and industrial sites world-wide are using HOL.