By William S. Massey

William S. Massey Professor Massey, born in Illinois in 1920, obtained his bachelor's measure from the college of Chicago after which served for 4 years within the U.S. military in the course of international battle II. After the conflict he bought his Ph.D. from Princeton college and spent extra years there as a post-doctoral learn assistant. He then taught for ten years at the college of Brown collage, and moved to his current place at Yale in 1960. he's the writer of diverse learn articles on algebraic topology and similar subject matters. This e-book constructed from lecture notes of classes taught to Yale undergraduate and graduate scholars over a interval of numerous years.

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## Extra info for Algebraic Topology: An Introduction (Graduate Texts in Mathematics) (v. 56)

Because the reader most likely is aware, we build a version of a Mobius strip via taking an extended, slim oblong strip of paper and gluing the ends including a part twist (see determine 1. 1). Mathematically, a Mobius strip is a topological house that's defined as follows. enable X denote the subsequent rectangle within the aircraft: X: {(x,y)ER2:—10§x§+10,—l

We will now describe the best way to supply many extra examples of compact surfaces by way of forming what are referred to as attached sums. allow S; and eighty two be disjoint surfaces. Their hooked up sum, denoted by way of eighty one # eighty two, is determine 1. three development of a projective aircraft from a sq.. three For a rigorous justiﬁcation of this statement, we needs to use Proposition four. 2 in Appendix A, that is appropriate as the average map from S' to the projective airplane is a closed map, and H is a closed subset of S”. part four Examples of Compact, hooked up 2-Manifolds / nine shaped through slicing a small round gap in each one floor, after which gluing the 2 surfaces jointly alongside the bounds of the holes.

There's one proviso, even if. all the steps calls for sure strategies of slicing and pasting jointly back. it truly is assumed that those cuts are made to be able to keep away from all the holes. it truly is transparent that this may continually be performed. it's also transparent that the‘number of holes is still unchanged all through these kind of steps. for this reason we receive one of many 3 kinds of polygons proven in determine 1. 32. For comfort, now we have taken lc = four in every one drawing. a (b) determine [. 32 (0) attainable sorts of bordered surfaces with ok = four.

Inspite of the expenditure of a lot attempt through many remarkable mathematicians through the years when you consider that Poincaré, it truly is nonetheless unknown even if this well-known conjecture is correct. you could provide examples of compact, simplyconnected 4-manifolds which aren't homeomorphic to S4 (e. g. , S2 X S2). although, for all integers n > three there's an analog of the Poincaré conjecture, specifically, compact n-manifold that has the homotopy form of an n-Sphere is homeomorphic to S". This generalized Poincaré conjecture used to be proved for n > four through S.

E. , it's a hexagon) and such that specific areas haven't any multiple facet in universal. eight. 6 allow SI be a floor that's the sum of m tori, m g 1, and permit S, be a floor that's the sum of n projective planes, n _2_ 1. believe holes are minimize in each one of those surfaces, and the 2 surfaces are then glued jointly alongside the bounds of the holes. What floor is bought via this approach? eight. 7 What floor is represented by way of a typical 10-gon with edges identiﬁed in pairs, as indicated by way of the emblem abcdec‘lda‘lb‘le‘l?