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» A New Lower Bound for A(17, 6, 6)
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IJAC
2006
93views more  IJAC 2006»
13 years 6 months ago
On Word Reversing in Braid Groups
It has been conjectured that in a braid group, or more generally in a Garside group, applying any sequence of monotone equivalences and word reversings can increase the length of a...
Patrick Dehornoy, Bert Wiest
APAL
2005
119views more  APAL 2005»
13 years 5 months ago
Elementary arithmetic
Abstract. There is a very simple way in which the safe/normal variable discipline of Bellantoni-Cook recursion (1992) can be imposed on arithmetical theories like PA: quantify over...
Geoffrey E. Ostrin, Stanley S. Wainer