most icons are taken from this site: http://us.metamath.org/symbols/symbols.html the license of these files is the creative commons public domain dedication git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@18183 a592a061-630c-0410-9148-cb99ea01b6c8
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@7829 a592a061-630c-0410-9148-cb99ea01b6c8
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@5687 a592a061-630c-0410-9148-cb99ea01b6c8
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@5685 a592a061-630c-0410-9148-cb99ea01b6c8