Mon, 11 Feb 2019 14:36:23 +0000 added partial derivative proof from Antimirov
Christian Urban <urbanc@in.tum.de> [Mon, 11 Feb 2019 14:36:23 +0000] rev 308
added partial derivative proof from Antimirov
(0) -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 tip