Isabelle2016 is now available.

This version improves upon Isabelle2015 in many ways, see the NEWS file in the distribution for further details. Some highlights are as follows:

Enhanced Isabelle/jEdit Prover IDE, with separate State versus Output panel and more asynchronous task management within the prover/GUI.

Additional Isar language elements for structured statements and proofs.

Document language refinements, with Markdown-like text structure.

More Isabelle symbols in theory and document sources.

Pure/HOL: uniform treatment of overloaded constant definitions versus type definitions; upgrade of HOL typedef to definitional principle.

to definitional principle. HOL tool enhancements: Sledgehammer, Nitpick, Quickcheck, Transfer.

HOL library additions and improvements, notably HOL-Multivariate_Analysis, HOL-Probability, HOL-Data_Structures.

Upgrade to Poly/ML 5.6 with debugger IDE support (Isabelle/ML and Standard ML), per-thread profiling, native Windows version (32bit and 64bit).

You may get Isabelle2016 from the following mirror sites: