# An Invitation to Morse Theory (2nd Edition) (Universitext) by Liviu Nicolaescu

By Liviu Nicolaescu

This self-contained remedy of Morse thought specializes in functions and is meant for a graduate path on differential or algebraic topology. The e-book is split into 3 conceptually unique elements. the 1st half comprises the principles of Morse concept. the second one half comprises functions of Morse conception over the reals, whereas the final half describes the fundamentals and a few functions of advanced Morse thought, a.k.a. Picard-Lefschetz theory.

This is the 1st textbook to incorporate themes equivalent to Morse-Smale flows, Floer homology, min-max concept, second maps and equivariant cohomology, and intricate Morse thought. The exposition is better with examples, difficulties, and illustrations, and may be of curiosity to graduate scholars in addition to researchers. The reader is predicted to have a few familiarity with cohomology concept and with the differential and quintessential calculus on delicate manifolds.

Some beneficial properties of the second one variation comprise additional purposes, similar to Morse thought and the curvature of knots, the cohomology of the moduli area of planar polygons, and the Duistermaat-Heckman formulation. the second one variation additionally encompasses 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**

A similar argument applies to derivatives with respect to the ξ variables. 2. 29) m n a ˜ ∈ S∞ (R2n (x,y) ; Rξ ). The extra ‘weight’ factor (which allows polynomial growth in the direction of x − y) turns out, somewhat enigmatically, to both make no difference and be very useful! 30) |Dxα Dyβ Dξγ a(x, y, ξ)| ≤ Cα,β,γ (1 + |x − y|)w (1 + |ξ|)m−|γ| ∀ α, β, γ ∈ Nn0 . 31) |a(x, y, ξ)u(y)| ≤ C(1 + |x − y|)w (1 + |ξ|)m (1 + |y|)−N ≤ C(1 + |x|)w (1 + |ξ|)m (1 + |y|)m , m < −n. 32) (1 + |x − y|)w ≤ (1 + |x|)w (1 + |y|)w (1 + |x|)w (1 + |y|)−w if w > 0 if w ≤ 0.

50) m−N aj ∈ S∞ (Rp ; Rn ). 51) aj . 3. 50), and the asymptotic sum is well defined up to an additive −∞ term in S∞ (Rp ; Rn ). Proof. The uniqueness part is easy. 50). 52) m−N aj ) ∈ S∞ (Rp ; Rn ). aj − a − a−a = a− j=0 j=0 −∞ −N Since S∞ (Rp ; Rn ) is just the intersection of the S∞ (Rp ; Rn ) −∞ p n that a − a ∈ S∞ (R ; R ), proving the uniqueness. over N it follows So to the existence of an asymptotic sum. To construct this (by Borel’s method) we cut off each term ‘near infinity in ξ’. Thus fix φ ∈ C ∞ (Rn ) with φ(ξ) = 0 in |ξ| ≤ 1, φ(ξ) = 1 in |ξ| ≥ 2, 0 ≤ φ(ξ) ≤ 1.

36 2. 39). 41) holds). In fact we will pick up some more information along the way. 4. 2. 34) (for any w) is the same as the range of I restricted to the image of the inclusion map n m a −→ a(x, ξ) ∈ S∞ (R2n (x,y) ; R ). m S∞ (Rn ; Rn ) Proof. Suppose a ∈ 1 + |x − y|2 w/2 −∞ S∞ (R2n ; Rn ) for some w, then I (xj − yj )a = I −Dξj a j = 1, . . , n. 34) and integrating by parts. 43) are continuous on w/2 ∞ 1 + |x − y|2 S∞ (R2n ; Rn ) the identity holds in general. 43) shows that even though the operator with amplitude (xj − yj )a(x, y, ξ) appears to have order m, it actually has order m − 1.