By Liviu Nicolaescu

This self-contained remedy of Morse thought makes a speciality of functions and is meant for a graduate path on differential or algebraic topology. The ebook is split into 3 conceptually designated elements. the 1st half comprises the principles of Morse conception. the second one half contains functions of Morse idea over the reals, whereas the final half describes the fundamentals and a few purposes of advanced Morse thought, a.k.a. Picard-Lefschetz theory.

This is the 1st textbook to incorporate themes reminiscent of Morse-Smale flows, Floer homology, min-max concept, second maps and equivariant cohomology, and intricate Morse concept. The exposition is superior with examples, difficulties, and illustrations, and should be of curiosity to graduate scholars in addition to researchers. The reader is anticipated to have a few familiarity with cohomology idea and with the differential and essential calculus on gentle manifolds.

Some good points of the second one variation contain further purposes, corresponding to Morse concept and the curvature of knots, the cohomology of the moduli area of planar polygons, and the Duistermaat-Heckman formulation. the second one variation additionally incorporates a new bankruptcy on Morse-Smale flows and Whitney stratifications, many new workouts, and diverse corrections from the 1st variation.

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**Extra resources for An Invitation to Morse Theory (2nd Edition) (Universitext)**

**Sample text**

S; t / is required to satisfy a certain partial differential equation that I will not write down. s/ which depends only on the location s on the rod. 1/ D 0. s; y/ D 0: In addition, the mathematical modeling of the physical process tells us something about the functions k and q. The function k is the thermal conductivity of the rod. y/. y/ > 0 for all temperatures y. s/ > 0 for all s. Now we can start to analyze the differential equation from an entirely mathematical point of view. s; y; y 0 /: k The significant point is that even though we replaced q by a linear approximation with respect to y, the function f is still nonlinear because it is quadratic in y 0 .

1/n f . f; U / . 1/n n , we can see that the definition of the Brouwer degree is independent of that single choice. Chapter 9 Properties of the Brouwer Degree This chapter is devoted to the properties of the Brouwer degree that we will need in order to extend it to the Leray–Schauder degree. In all that follows, we assume that U is an open subset of Rn and that we have a map f W U ! f; U / is well defined. The properties of the degree are given names for easy identification; the terminology I’m using for this purpose is pretty much standard.

This forms a normed linear space under term-by-term addition of sequences and the obvious scalar product, and with norm v uX u1 2 x : kxk D t j j D0 The unit ball C in X , that is, the set of points x such that kxk Ä 1, is certainly closed, bounded, and convex. x/k D . 1 kxk2 / C kxk2 D 1 then f takes C to itself, in fact to the unit sphere S in X , that is, the subset consisting of sequences of norm exactly 1. This function f W C ! S C is continuous because we can write it as a composition of functions that are obviously continuous.