Tue, 28 Sep 2021 10:38:36 +0200 desharna added Zipperposition to sledgehammer's default provers
Mon, 27 Sep 2021 20:45:26 +0200 wenzelm provide zipperposition-2.1 (still unused);
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -2 +2 +10 +30 +100 +300 +1000 +3000 tip