Wed, 08 Sep 1999 15:38:12 +0200 images and preimages of the identity function
paulson [Wed, 08 Sep 1999 15:38:12 +0200] rev 7514
images and preimages of the identity function
(0) -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip