By Andrew H. Wallace

ISBN-10: 0486457869

ISBN-13: 9780486457864

This self-contained therapy assumes just some wisdom of genuine numbers and actual research. the 1st 3 chapters specialise in the fundamentals of point-set topology, and then the textual content proceeds to homology teams and non-stop mapping, barycentric subdivision, and simplicial complexes. routines shape an essential component of the textual content. 1961 variation.

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**Extra info for An Introduction to Algebraic Topology**

**Sample text**

X /. X // D ! for any space X . 237. X /. 3 Linear Topological Spaces and l-Equivalence 31 238. X /. 239. X / 2 P. 240. X //. 241. Prove that, for any space X , we have the following equalities. X //. 242. X //. 243. X /. 244. Denote by L the following collection of classes of Tychonoff spaces: fanalytic spaces, K-analytic spaces, -compact spaces, Lindelöf ˙-spaces, realcompact spacesg. X / belongs to P. 245. w/ D fx1 ; : : : ; xn g. w/ D ;. X / ! R. w/ W w 2 Bg is bounded in the space X . 246.

L/g, induced by . L/. The space L is barreled if any convex closed balanced and absorbing subset of L is a neighborhood of 0 in L. Y; U / is a uniform space. y// 2 U for any y 2 V and f 2 F. If the family F is equicontinuous at every x 2 X , it is called equicontinuous. x/j < " for any y 2 U and f 2 F. V / U for any f 2 F. Suppose that X is a space and C is a cover of X . Pi / . "; "/ for all i Ä ng. X /; C / is a linear topological space. The topology C is called the topology of uniform convergence on the elements of C.

Let U D fU1 ; : : : ; Uk g be a functionally open cover of a Tychonoff space X . Prove that U has shrinkings F D fF1 ; : : : ; Fk g and W D fW1 ; : : : ; Wk g such that F is functionally closed, W is functionally open and Fi Wi W i Ui for every i Ä k. 143. Let U D fU1 ; : : : ; Uk g be an open cover of a normal space X . Prove that U has shrinkings F D fF1 ; : : : ; Fk g and W D fW1 ; : : : ; Wk g such that F is closed, W is open, and Fi Wi W i Ui for every i Ä k. 144. Prove that, for any Tychonoff space X , the following conditions are equivalent: (i) dim X Ä n; (ii) every finite functionally open cover of X has a finite functionally closed refinement of order Ä n C 1; (iii) every finite functionally open cover of X has a functionally closed shrinking of order Ä n C 1; (iv) every finite functionally open cover of X has a functionally open shrinking of order Ä n C 1.

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