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Unformatted text preview: 7.3. SINGULAR HOMOLOGY GROUPS 181 3. Therefore, a multiple gp of a single point is not a boundary for any g , 0. 4. Thus, any point p M is a 0cycle that is not a boundary. 5. Moreover, for any g G and any p M the 0chain gp is a 0cycle that is not a boundary. In particular, H ( M ; Z ) = { , p , 2 p , . . . } and H ( M ; R ) = R is a onedimensional vector space. Corollary 7.3.3 Let M be a compact connected manifold. Then the zero Betti number is equal to B ( M ) = 1 . Proof : Follows from above. Theorem 7.3.4 Let M be a compact manifold consisting of k con nected pieces M 1 , . . . M k . Then H ( M ; R ) = R p 1 + + R p k , where p i M i , i = 1 , . . . , k, meaning R p 1 + + R p k = k X i = 1 a i p i a i R , p i M i , i = 1 , . . . , k . Proof : In this case H ( M ; R ) = R k is a kdimensional vector space....
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This note was uploaded on 11/26/2011 for the course MAT 4821 taught by Professor Wong during the Spring '10 term at FSU.
 Spring '10
 Wong
 Geometry

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