𝔖 Bobbio Scriptorium
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When is a X2 not a X2?

✍ Scribed by A. C. KIMBER


Book ID
111016236
Publisher
John Wiley and Sons
Year
1987
Tongue
English
Weight
314 KB
Volume
9
Category
Article
ISSN
0141-982X

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The result stated in the title is proved in this note. Actually we show that S x N is not a circle order, where S = {( 1, I), (1,2), (1,3), (2, I), (2, 3)}. Furthermore this non-circle order is critical in the sense that (S -{x}) x N is a circle order for any x in S.