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Additional info for A Classical Introduction to Modern Number Theory (Graduate Texts in Mathematics, Volume 84)
Tp) = x + tIVl (X) + . . + tpvP(x) . Clearly dg ex ; o , " " O ) is nonsingular; hence g maps some neighborhood of (x, 0) E N X RP diffeomorphically onto an open set . We will prove that g is one-one on the entire neighborhood N X U, of N X 0, providing that E > 0 is sufficiently small ; where U, denotes the E-neighborhood of 0 in RP• For otherwise there would exist pairs (x, u) � (x', u') in N X RP with I l ul l and I lu' l l arbitrarily small and with g(x, u) = g(x ' , u ' ). The PontTyagin construction Since N is compact, we could choose a sequence of such pairs with x converging, say to Xo, with x' converging to X6, and with u -+ 0 and u' -+ o.
Thus the degree of F I a([O, 1] X lVr) at a regular value y is equal to the difference deg(g ; y) - d eg(f ; y) . According to Lemma 1 this difference must be zero . The remainder of the proof of Theorems A and B is completely analogous to the argument in §4 . If y and z are both regular values for f : 111 --+ N, choose a diffeomorphism h : N --+ N that carries y to z and is isotopic to the identity. Then h will preserve orientation, and deg(f ; y) = d eg(h by inspection. But f is homotopic to h deg(h 0 by Lemma 2.
Here HiCM) denotes the i-th homology group o f M . This will b e our first and last reference to homology theory. §6. Vector fields 36 Lemma 3 (Hopf) . If v : X -+ Rm is a smooth vector field with isolated zeros, and if v points out of X along the boundary, then the index sum L � is equal to the degree of the Gauss mapping from ax to sm- I . In particular, L � does not depend on the choice of v . For example, if a vector field on the disk Dm points outward along the boundary, then L � = + 1. ) Figure 13.