Fri, 24 May 2013 15:43:10 +0100 added definitions and proofs for right-std and left-std tapes
Christian Urban <christian dot urban at kcl dot ac dot uk> [Fri, 24 May 2013 15:43:10 +0100] rev 260
added definitions and proofs for right-std and left-std tapes
(0) -100 -30 -10 -1 +1 +10 +30 tip