On the h-enclosability of spheres
1972 ◽
Vol 72
(2)
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pp. 185-188
Keyword(s):
Let Bk, Mn, Np be manifolds in the category C = Top, Duff or PL. Define Mn and Np to be h-enclosable in Bk if (1) k = n + p + 1, (2) there are C-imbeddings i:Mn ⊆ Bk and j: Np ⊆ Bk with disjoint images and (3) there are de formation retractions of Bk − i(Mn) onto j(Np) and of Bk − j(NP) onto i(Mn). This is expressed as Bk = [Mn, NP/i, j] (mod C). The manifolds are trivially h-enclosable in Bk if, in addition, each manifold has a product tubular neighbourhood in the category C.
Keyword(s):
1996 ◽
Vol 120
(2)
◽
pp. 237-245
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1966 ◽
Vol 62
(2)
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pp. 177-181
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1999 ◽
Vol 42
(4)
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pp. 486-498
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1990 ◽
Vol 108
(2)
◽
pp. 299-306
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2005 ◽
Vol 16
(01)
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pp. 1-12
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