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Unformatted text preview: 1.3. TANGENT VECTORS AND MAPPINGS 19 • Theorem 1.3.2 Let n and r be two positive integers such that n > r. Let M be an ndimensional manifold and N be an rdimensional man ifold. Let q ∈ N be a point in N such that the inverse image W = F 1 ( q ) , ∅ is nonempty. Suppose that for each point p ∈ W the di ff er ential F * of the map F is surjective, that is, has the maximal rank rank F * ( p ) = r . Then W is an ( n r ) dimensional submanifold of M. • Example. Morse Map. (Height function F : M → R for trousers surface M in R 3 ). • Let p ∈ M and v ∈ T p M be a tangent vector to M at p . Then F * : T p M → R = T F ( p ) M is the projection of v to zaxis defined by F * ( v 1 , v 2 , v 3 ) = v 3 . • Let p ∈ M and z = F ( p ). F 1 ( z ) is an embedded submanifold if F * is onto, that is, T p M is not horizontal. If T p M is horizontal, then F * = (hence, not onto)....
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 Spring '10
 Wong
 Geometry, Vectors, Integers, Manifold, Differential topology, inverse image, R. Let M

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