By Mahima Ranjan Adhikari

ISBN-10: 8132228413

ISBN-13: 9788132228417

ISBN-10: 813222843X

ISBN-13: 9788132228431

This ebook presents an obtainable advent to algebraic topology, a ﬁeld on the intersection of topology, geometry and algebra, including its functions. in addition, it covers numerous similar themes which are actually vital within the total scheme of algebraic topology. Comprising eighteen chapters and appendices, the publication integrates quite a few ideas of algebraic topology, supported by means of examples, routines, functions and historic notes. basically meant as a textbook, the publication oﬀers a invaluable source for undergraduate, postgraduate and complex arithmetic scholars alike.

Focusing extra at the geometric than on algebraic elements of the topic, in addition to its ordinary improvement, the ebook conveys the fundamental language of contemporary algebraic topology through exploring homotopy, homology and cohomology theories, and examines a number of areas: spheres, projective areas, classical teams and their quotient areas, functionality areas, polyhedra, topological teams, Lie teams and phone complexes, and so forth. The booklet experiences various maps, that are non-stop capabilities among areas. It additionally finds the significance of algebraic topology in modern arithmetic, theoretical physics, laptop technology, chemistry, economics, and the organic and clinical sciences, and encourages scholars to have interaction in extra study.

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**Extra resources for Basic Algebraic Topology and its Applications**

**Example text**

2 (i) monomorphism. f (ii) → 0, f is an epimorphism. , i(x) = x for all x ∈ G), then the sequence (iv) f p i →0 0− → G −−−→ K −−−→ K /G − is an exact sequence, where 0 denotes the trivial group and p is the natural homomorphism defined by p(x) = x + G for all x ∈ K . 4 (The Five Lemma) Let the diagram in Fig. 1 of groups and homomorphisms be commutative with two exact rows. If α is an epimorphism, λ is a monomorphism and β, δ are isomorphisms, then γ is an isomorphism. 5 Given an exact sequence of abelian groups and homomorphisms g f 0− → G −−−→ K −−−→ H − →0 if h : H → K is a homomorphism such that g ◦ h : H → H is the identity automorphism of H , then K ∼ = G ⊕ H.

N such that Ui j = X . If X j=1 is a compact space, every sequence of points xn of X has a convergent subsequence, which means, every subsequence xn 1 , xn 2 , . . , xn t , . . , converges to a point of X . For metric spaces, this condition is equivalent to compactness. 51 A compact subspace of a topological space X is closed in X and every closed subspace of a compact space is compact. 52 A topological space X is said to be locally compact if each of its points has a compact neighborhood. 53 Any compact space, Rn , any discrete space, any closed subset of a locally compact space are locally compact spaces.

20 Let G be an additive abelian group. G is said to be a free group with a basis B if (i) for each b ∈ B, the cyclic group b is infinite; and (ii) G = b (direct sum). 21 If G is a free abelian group with a basis B = {b1 , b2 , . . , bn }, then n is uniquely determined by G, and G is then said to be free abelian group of rank n. 22 An abelian group G is said to be a finitely generated abelian group if G has a finite basis. 23 Basis of a finitely generated abelian group is not unique. For example, {(1, 0), (0, 1)} and {(−1, 0), (0, −1)} are two different bases of the group Z ⊕ Z.

### Basic Algebraic Topology and its Applications by Mahima Ranjan Adhikari

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