Wed, 25 Aug 1999 10:45:41 +0200 new theorem inv_f_eq
paulson [Wed, 25 Aug 1999 10:45:41 +0200] rev 7338
new theorem inv_f_eq
(0) -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip