Wed, 15 Sep 2010 15:44:24 +0200 put "foldl" and "foldr" in "Useful";
blanchet [Wed, 15 Sep 2010 15:44:24 +0200] rev 39409
put "foldl" and "foldr" in "Useful"; Isabelle hides those symbols from List, but by adding them to Useful we have them throughout Metis without "List." prefix
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip