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Abstract
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It is known that every oriented integral homology
–sphere can be
obtained from
by a finite sequence of Borromean surgeries. We give an explicit formula
for the variation of the Casson invariant under such a surgery move. The
formula involves simple classical invariants, namely the framing, linking
number and Milnor’s triple linking number. A more general statement, for
independent Borromean surgeries, is also provided.
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Keywords
Casson invariant, Borromean surgery, finite type invariants
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Mathematical Subject Classification 2000
Primary: 57N10, 57M27
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Publication
Received: 5 February 2008
Revised: 3 March 2008
Accepted: 5 March 2008
Published: 25 May 2008
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