2016-04-25 wenzelm 2016-04-25 eliminated old 'def'; tuned comments;
2015-12-20 wenzelm 2015-12-20 tuned whitespace;
2015-11-02 wenzelm 2015-11-02 tuned document;
2015-11-02 wenzelm 2015-11-02 isabelle update_cartouches -t;
2015-10-19 wenzelm 2015-10-19 tuned document;
2015-06-13 wenzelm 2015-06-13 tuned proofs;
2014-11-13 wenzelm 2014-11-13 uniform treatment of all document markup commands: 'text' and 'txt' merely differ in LaTeX style; discontinued obsolete 'txt_raw' (superseded by 'text_raw'); eliminated obsolete Outer_Syntax.markup (superseded by keyword kinds); 'text' and 'txt' no longer appear in Sidekick tree due to change of keyword kind; changed tagging of diagnostic commands within proof;
2014-11-02 wenzelm 2014-11-02 modernized header uniformly as section;
2014-10-21 wenzelm 2014-10-21 update_cartouches;
2012-10-19 webertj 2012-10-19 Renamed {left,right}_distrib to distrib_{right,left}.
2012-04-12 krauss 2012-04-12 Set_Algebras: removed syntax \<oplus> and \<otimes>, in favour of plain + and *
2011-08-13 huffman 2011-08-13 HOL-Hahn_Banach: use Set_Algebras library
2009-10-17 wenzelm 2009-10-17 eliminated hard tabulators, guessing at each author's individual tab-width; tuned headers;
2009-06-24 wenzelm 2009-06-24 standard naming conventions for session and theories;