By Loring W. Tu

Manifolds, the higher-dimensional analogs of tender curves and surfaces, are basic gadgets in sleek arithmetic. Combining features of algebra, topology, and research, manifolds have additionally been utilized to classical mechanics, basic relativity, and quantum box theory.

In this streamlined advent to the topic, the speculation of manifolds is gifted with the purpose of aiding the reader in achieving a swift mastery of the fundamental themes. via the tip of the booklet the reader might be capable of compute, not less than for easy areas, the most simple topological invariants of a manifold, its de Rham cohomology. alongside the way in which the reader acquires the data and abilities invaluable for extra learn of geometry and topology. The considered necessary point-set topology is integrated in an appendix of twenty pages; different appendices evaluation proof from genuine research and linear algebra. tricks and suggestions are supplied to some of the routines and problems.

This paintings can be used because the textual content for a one-semester graduate or complicated undergraduate path, in addition to through scholars engaged in self-study. Requiring merely minimum undergraduate prerequisites, *An Introduction to Manifolds* is additionally a very good beginning for Springer GTM eighty two, *Differential types in Algebraic Topology.*

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**Extra resources for An Introduction to Manifolds**

**Example text**

2). These two maps are called the transition functions between the charts. If U ∩ V is empty, then the two charts are automatically C ∞ -compatible. To simplify the notation, we will sometimes write Uαβ for Uα ∩ Uβ and Uαβγ for Uα ∩ Uβ ∩ Uγ . 2 Compatible Charts 49 ψ φ φ(U ∩ V ) U V Fig. 2. The transition function ψ ◦ φ −1 is defined on φ(U ∩ V ). Since we are interested only in C ∞ -compatible charts, we often omit to mention and speak simply of compatible charts. 7. , such that M = α Uα . Although the C ∞ compatibility of charts is clearly reflexive and symmetric, it is not transitive.

23 (The sign of a permutation). Show that sgn τ = (−1)k . 24. If f is a k-covector on V and k is odd, then f ∧ f = 0. Proof. By anticommutativity, 2 f ∧ f = (−1)k f ∧ f = −f ∧ f, since k is odd. Hence, 2f ∧ f = 0. Dividing by 2 gives f ∧ f = 0. 9 Associativity of the Wedge Product If f is a k-covector and g is an -covector, we have defined their wedge product to be the (k + )-covector 1 f ∧g = A(f ⊗ g). k! To prove the associativity of the wedge product, we will follow Godbillon [7] by first proving the following lemma on the alternating operator A.

It is locally Euclidean, because it is homeomorphic to R via (x, x 2/3 ) → x. (a) Cusp (b) Cross Fig. 1. 5 (The cross). 1 with the subspace topology is not locally Euclidean at p, and so cannot be a topological manifold. Solution. If a space is locally Euclidean of dimension n at p, then p has a neighborhood U homeomorphic to an open ball B := B(0, ) ⊂ Rn with p mapping to 0. The homeomorphism: U − → B restricts to a homeomorphism: U − {p} − → B − {0}. Now B − {0} is either connected if n ≥ 2 or has two connected components if n = 1.