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Differential Algebraic Topology
This book presents some basic concepts and results from algebraic topology. Topics covered includes: Smooth manifolds revisited, Stratifolds, Stratifolds with boundary: c-stratifolds, The Mayer-Vietoris sequence and homology groups of spheres, Brouwer’s fixed point theorem, separation and invariance of dimension, Integral homology and the mapping degree, A comparison theorem for homology theories and CW-complexes, Kunneth’s theorem, Singular cohomology and Poincare duality, Induced maps and the cohomology axioms, The Chern classes, Pontrjagin classes and applications to bordism, Constructions of stratifolds.
Author(s): Matthias Kreck
168 Pages 
Topics in Differential Topology by Mohammad F Tehrani
This note explains the following topics: preliminaries, Different homology theories and their interaction, Classifying spaces, An introduction to symplectic topology.
Author(s): Mohammad F Tehrani
104 Pages
Topology from the Differentiable Viewpoint
This PDF covers the following topics related to Differential Topology : Smooth manifolds and smooth maps, Tangent spaces and derivatives, Regular values, The fundamental theorem of algebra, The theorem of Sard and Brown, Manifolds with boundary, The Brouwer fixed point theorem, Proof of Sard's theorem, The degree modulo 2 of a mapping, Smooth homotopy and smooth isotopy, Oriented manifolds, The Brouwer degree, Vector fields and the Euler number, Framed cobordism, the Pontryagin construction, The Hopf theorem, Exercise.
Author(s): John W. Milnor, Princeton University
77 Pages
An Introduction to Differential Topology, de Rham Theory and Morse Theory
This note covers the following topics: Basics of Differentiable Manifolds, Local structure of smooth maps, Transversality Theory, IDifferential Forms and de Rham Theory, TIensors and some Riemannian Geometry.
Author(s): Michael Muger
80 Pages
Differential topology Lecture notes (PDF 20p)
This note covers the following topics: Smooth manifolds and smooth maps, Tangent spaces and differentials , Regular and singular values , Manifolds with boundary, Immersions and embeddings , Degree mod 2 , Orientation of manifolds and Applications of degree.
Author(s): Sergei Tabachnikov
20 Pages