chapter_definition HOL
description "
Higher-Order Logic.
Isabelle/HOL is a version of classical higher-order logic resembling
that of the HOL System (https://www.cl.cam.ac.uk/Research/HVG/HOL).
"
chapter_definition ZF
description "
Zermelo-Fraenkel set theory.
Isabelle/ZF offers a formulation of Zermelo-Fraenkel set theory on top of
Isabelle/FOL.
"
chapter_definition FOL
description "
First-Order Logic with some variations: single-sorted vs. many-sorted
(polymorphic), classical vs. intuitionistic, domain-theory (LCF).
"
chapter_definition Pure
description "
The Pure logical framework.
Isabelle/Pure is a version of intuitionistic higher-order logic that
expresses rules for Natural Deduction declaratively.
"
chapter_definition Misc
description "
Miscellaneous object-logics, tools, and experiments.
"
chapter_definition Doc
description "
Sources of Documentation.
"