Subject: Announcing Isabelle2020To: isabelle-users@cl.cam.ac.ukIsabelle2020 is now available.This version introduces many changes over Isabelle2019: see the NEWSfile for further details. Here are some notable points:* PIDE: much faster startup of Isabelle/jEdit thanks to more scalablesession directory structure.* PIDE: updated Isabelle/VSCode to follow recent moves of VSCode.* Pure: improved treatment of theorem dependencies and proof terms,accessible via command 'thm_deps'.* Pure: proper treatment of oracles within internal proof objects,accessible via command 'thm_oracles'.* HOL: various library improvements.* HOL: better organization of HOL-Analysis vs. HOL-Complex_Analysis.* ML: more scalable export artifacts via XML blobs.* Scala: support for external IDEs based on Gradle (e.g. IntelliJ IDEA).* Scala: support for Ubuntu server applications (Linux-Apache-MySQL-PHP).* System: Isabelle/Phabricator as self-hosted project management platform.* System: update to current Poly/ML 5.8.1 with improved robustness,especially on Windows.* System: improved support for macOS, notably 10.15 Catalina.You may get Isabelle2020 from the following mirror sites: Cambridge (UK) https://www.cl.cam.ac.uk/research/hvg/Isabelle Munich (Germany) https://isabelle.in.tum.de Sydney (Australia) https://mirror.cse.unsw.edu.au/pub/isabelle Potsdam, NY (USA) https://mirror.clarkson.edu/isabelle