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Andreotti–Frankel theorem : ウィキペディア英語版
Andreotti–Frankel theorem
In mathematics, the Andreotti–Frankel theorem, introduced by , states that if V is a smooth affine variety of complex dimension n or, more generally, if V is any Stein manifold of dimension n, then in fact V is homotopy equivalent to a CW complex of real dimension at most ''n''. In other words
V has only half as much topology.
Consequently, if V \subseteq \mathbb^r is a closed connected complex submanifold of complex dimension n, then V has the homotopy type of a CW complex of real dimension \le n.
Therefore
:H^i(V; \bold Z)=0,\texti>n \,
and
:H_i(V; \bold Z)=0,\texti>n. \,
This theorem applies in particular to any smooth affine variety of dimension n.
==References==

*
*John Willard Milnor (1963), ''Morse Theory'', Ch. 7.


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