You can deleteGlossary.tex#delete mathematics and text with the keyboard or the mouse.
If you delete information in error, you can reinsert it immediately with the Undo DeletionUndo_deletion.tex command. However, the deleted information will be lost if you enter something or use the Cut, Copy or Paste commands before you try to undo the deletion.
When you delete text or mathematics, the program remembers the tags and mathematics state in effect for the first object in the deletion. If you don't move the insertion point before you enter new text, the program applies the remembered tags and mathematics state to the new text. If you move the insertion point before you enter new text, the program discards the remembered information.