2012
DOI: 10.2422/2036-2145.2011.4.03
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Global classification of isolated singularities in dimensions (4,3) and (8,5)

Abstract: We characterize those closed 2k-manifolds admitting smooth maps into (k + 1)-manifolds with only finitely many critical points, for k ∈ {2, 4}. We compute then the minimal number of critical points of such smooth maps for k = 2 and, under some fundamental group restrictions, also for k = 4. The main ingredients are King's local classification of isolated singularities, decomposition theory, low dimensional cobordisms of spherical fibrations and 3-manifolds topology.

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Cited by 7 publications
(17 citation statements)
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“…Church and Timourian proved (see [6] and another proof in [8]) that all isolated singularities in codimensions at most 2 are cone-like. As Takens pointed out in [21], this is not anymore true in codimension 3 or higher.…”
Section: Introduction and Statementsmentioning
confidence: 97%
See 3 more Smart Citations
“…Church and Timourian proved (see [6] and another proof in [8]) that all isolated singularities in codimensions at most 2 are cone-like. As Takens pointed out in [21], this is not anymore true in codimension 3 or higher.…”
Section: Introduction and Statementsmentioning
confidence: 97%
“…In [1] the authors found that, in very small codimension, namely when 0 ≤ m − k ≤ 3, if ϕ(M m , N k ) is finite then ϕ(M m , N k ) ∈ {0, 1}, except for the exceptional pairs of dimensions (m, k) ∈ {(2, 2), (4,3), (4,2), (5,2), (6,3), (8,5)}. Moreover, ϕ(M, N ) = 1 if and only if M is diffeomorphic to the connected sum of a smooth locally trivial fibration over N with an exotic sphere while M is not a smooth fibration over N .…”
Section: Introduction and Statementsmentioning
confidence: 99%
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“…No Capítulo 4, objetivamos caracterizar NS-pares (S 5 , K) com dim K = 2, e usar tal caracterização para provar a existência de germes de aplicações polinomiais reais nãotriviais (R 6 , 0) → (R 3 , 0) com uma singularidade isolada na origem, respondendo o Problema 2.3.3 proposto por Milnor, que, segundo nossas pesquisas, se encontrava em aberto até o momento. Para isso, utilizamos ferramentas de espaços de configuração e um resultado de L. Funar provado em [20,Seção 2.7], o qual está enunciado na Seção 2.5 do Capítulo 2. Mais precisamente, primeiro classificaremos fibrados E 5 → S 2 cuja fibra é a 3-esfera com os interiores de uma união disjunta de 3-discos removidos, e que satisfazem a condição que as fibrações restritas ao bordo são triviais.…”
Section: Introductionunclassified