Invariant Basis Number and Types for Str
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Gene Abrams
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Article
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2001
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Elsevier Science
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English
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For any pair n , k of positive integers we produce a strongly Z -graded ring R 2 such that the identity component R has invariant basis number while the 0 integers n, k and n , k having n F n and k ยฌ k we produce a strongly Z -graded 2 ลฝ . ring R such that the basis-number type of R is n, k while t