fixed problematic addition operation in the 'approximation' package (previous version used much too high precision sometimes)

new lemmas

discontinue old Ubuntu 18.04 LTS, e.g. it cannot build documentation "prog-prove";

following recent Phabricator update, after 2021 Week 13 (Late March);

merged

Cosmetic: no !! in the lemma statement

clarified README; avoid odd patching of sources;

more standard header, with utf-8 encoding;

clarified HTML template (see also 04cb7e02ca38): avoid odd patching of sources;

merged

clarified signature;

clarified: follow "isabelle version -t";

further clarification of Isabelle distribution identification -- avoid odd patching of sources;

tuned signature -- more explicit types;

more robust and uniform ISABELLE_TAGS;

clarified ISABELLE_ID: distribution vs. hg archive vs. hg repos;

simplified release status (again), in contrast to a43898f76ae9;

more uniform HTTP resources;

new automatic order prover: stateless, complete, verified

clarified (again): local tip could be actually more recent;

tuned;

tuned;

clarified name;

more systematic java_library: avoid empty entries, declaration order as for other bash functions;

support sequential LaTeX jobs: more robust when TeX installation is self-installing packages etc.;

updated to latest latex due to new mechanism for dealing with bold ccfonts

removal of needless hypothesis in hd_rev and last_rev

more robust;

clarified message;

tuned;

tuned message;

proper export;

more options: build is part of default setup;

misc tuning and clarification;

more options;

proper Admin script, outside the settings environment;

tuned whitespace;

tuned;

clarified;

tuned message;

tuned message;

more accurate settings after update of current version;

clarified messages;

more robust: lest hg work out remote tip; more options;

more options;

clarified treatment of multiple versions: last one counts; more options;

more robust;

more robust: explicit repository root;

more robust;

more convenient repository setup;

tuned;

more robust invocation of hg;

more robust: idempotent;

more robust invocation of hg;

tuned;

clarified output; more options;

support repository archives (without full .hg directory);

more robust invocation of hg;

record official releases that follow a certain structure, with public access via https://isabelle.sketis.net/repos/isabelle/raw-file/tip/Admin/Release/official (NB: Isabelle2013-1 had to be retracted);

dedicated session for combinatorial material

support for Java Chromium Embedded Framework (JCEF): still somewhat fragile;

enforce full build;

turn LaTeX warning into error, for the sake of isabelle.sty/bbbfont;

discontinue fragile check in LaTeX, e.g. problems with toc entries;

merged

more NEWS;

clarified group (but hard to tell);

more glyphs proposed by Simon Foster: 0x002713, 0x002717, 0x002af4, 0x002afb, 0x002afd; corresponding symbols and latex macros;

merged

more lemmas

type class relaxation

clarified package name (actually both pxfonts and txfonts exist and have this font);

tuned;

prefer isabelle bbbfont;

enforce full build;

clarified symbol names, notably relevant for Z_Notation;

update README (actually after update of component);

high-quality blackboard-bold fonts from "txmia" (package "txfonts");

publish component;

further clarification of Z Notation symbols (notably glyphs 0x2119, 0x2A1F, 0x2982, 0x2A3E), by Simon Foster;

clarified \<Zcomp> (small) vs. \<Zsemi> (big);

more CONTRIBUTORS;

more Z_Notation symbols, as proposed by Simon Foster; some LaTeX-art based on tex.stackexchange "How do you make a square element symbol (\in)";

more accurate glyphs 0x25C1 / 0x25B7, based on 0x2A64 / 0x2A65 minus the "minus";

clarified order for GUI panel;

prefer more direct interpretation

more Z_Notation symbols, as proposed by Simon Foster;

more accurate spacing, according to results seen in isar-ref (Appendix B), using 12pt or 10pt;

clarified order for presentation in isar-ref (Appendix B);

prefer explicit \<Zproject> (with its own Unicode codepoint);

new stateless order prover by Lukas Stevens

new stateless order prover by Lukas Stevens

more Isabelle symbol definitions for Z Notation, based on https://github.com/isabelle-utp/Z_Toolkit 998c9f7880d3 by Simon Foster; NB: no bold version of 0x2900 due to fontforge crash "Internal Error: Some fragments did not join";

tuned message;

proper directory of settings file; tuned;

New stateless order prover by Lukas Stevens

tuned lemma

added lemma

tuned signature;

tuned signature (again);

tuned --- following hints by IntelliJ;

tuned comments;

proper shell quote;

removed spurious references to perl / libwww-perl;

invoke remote ATP via SystemOnTPTP.run_systems from Isabelle/Scala (without perl); clarified inlined command-line; clarified errors: exception ERROR becomes UnknownError (it could stem from Scala function);

clarified signature: refer to file name instead of file content;

compile;

clarified signature: more explicit types;

support for SystemOnTPTP.run_system, with strict error following scripts/remote_atp;

clarified signature;

elapsed time to download content (and for the server to provide content);

more direct elapsed run_time via bash_process wrapper (via Scala and C);

merged

use SystemOnTPTP.list_systems from Isabelle/Scala, with dynamic URL option and more elementary error messages;

clarified signature: let Sledgehammer handle SystemOnTPTP comments;

clarified signature: url may change dynamically and is part of result;

clarified error;

support timeout, similar to perl LWP::UserAgent;

clarified signature;

tuned;