A Note on Heegaard Splittings of Amalgamated 3-Manifolds

Let M be a compact orientable irreducible 3-manifold, and F be an essential connected closed surface in M which cuts M into two manifolds M1 and M2. If Mi has a minimal Heegaard splitting Mi = Vi∪Hi Wi with d(H1) + d(H2) ≥ 2(g(M0 + g(M2) - g(F)) + 1, then g(M) = g(M1) + g(M2) - g(F)....

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Veröffentlicht in:Chinese annals of mathematics. Serie B 2011-05, Vol.32 (3), p.475-482
Hauptverfasser: Du, Kun, Gao, Xutao
Format: Artikel
Sprache:eng
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Zusammenfassung:Let M be a compact orientable irreducible 3-manifold, and F be an essential connected closed surface in M which cuts M into two manifolds M1 and M2. If Mi has a minimal Heegaard splitting Mi = Vi∪Hi Wi with d(H1) + d(H2) ≥ 2(g(M0 + g(M2) - g(F)) + 1, then g(M) = g(M1) + g(M2) - g(F).
ISSN:0252-9599
1860-6261
DOI:10.1007/s11401-011-0641-8