Abstract:Zur Erinnerung an meinen Freund Ulrich von HundetshausenDiese Arbeit verdankt ihr Entstehen dem Wunsch, Beispiele zu konstruieren fiir das Zusammenblasen von Deformationen der Aufl/3sung einer rationalen Singularit~it zu Deformationen der Singularit~it selbst (vgl. [13]). Der Einfachheit halber haben wir uns dabei zun~ichst auf diejenigen rationaten Singularit~iten beschr~inkt, ftir die der zu dem exzeptionellen Kurvensystem einer minimalen AufliSsung gehiSrende duale Graph unverzweigt ist. Dies sind bekanntli… Show more
“…By Donaldson's theorem on the intersection form of definite 4-manifolds [3], the intersection forms of X Y and X We now briefly recall Riemenschneider's point rule [12]. Let p > q > 0 be coprime integers, and suppose This concludes the proof.…”
Section: Proof Of Theorem 11: Second Halfmentioning
We classify connected sums of three-dimensional lens spaces which smoothly bound rational homology balls. We use this result to determine the order of each lens space in the group of rational homology 3-spheres up to rational homology cobordisms, and to determine the concordance order of each 2-bridge knot.57M99; 57M25
“…By Donaldson's theorem on the intersection form of definite 4-manifolds [3], the intersection forms of X Y and X We now briefly recall Riemenschneider's point rule [12]. Let p > q > 0 be coprime integers, and suppose This concludes the proof.…”
Section: Proof Of Theorem 11: Second Halfmentioning
We classify connected sums of three-dimensional lens spaces which smoothly bound rational homology balls. We use this result to determine the order of each lens space in the group of rational homology 3-spheres up to rational homology cobordisms, and to determine the concordance order of each 2-bridge knot.57M99; 57M25
“…. , a n 3 ,3 ) are related to one another by Riemenschneider's point rule [11]. A notion that will appear in the text and is related to complementary legs is that of the dual of a string of integers (a 1 , .…”
In this short note we study some particular graphs associated to small Seifert spaces and Montesinos links. The study of these graphs leads to new examples of Seifert manifolds bounding rational homology balls and Montesinos links bounding smoothly and properly embedded surfaces (possibly not orientable) in the 4 ball with Euler characteristic equal to 1.
“…(1) and (2) are known ( [30]), and (5) follows easily from (2). To show (3) and (4), we may assume that c ; = 1.…”
Section: S G Is a CL If And Only If G Is Conjugate To One Of The Gromentioning
confidence: 99%
“…Thus the assertions are evident (cf. [30]). [25,21]), Xf -Xf is a relative invariant of L, and hence both Xf + Xf and (X x Xj) q are relative invariants of L. Clearly L\9t{CX x Θ CX,; L) is cyclic, and we must have…”
Section: S G Is a CL If And Only If G Is Conjugate To One Of The Gromentioning
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