# A Combinatorial Introduction to Topology (Dover Books on by Michael Henle

By Michael Henle

First-class textual content for upper-level undergraduate and graduate scholars exhibits how geometric and algebraic rules met and grew jointly into a major department of arithmetic. Lucid assurance of vector fields, surfaces, homology of complexes, even more. a few wisdom of differential equations and multivariate calculus required. Many difficulties and workouts (some strategies) built-in into the textual content. 1979 variation. Bibliography.

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Extra info for A Combinatorial Introduction to Topology (Dover Books on Mathematics)

Example text

Therefore, # ( ( 5 n U T „) \ C*) < - 7 1 - 73 + n - n*0. In the construction of ¿>n+i and Tn+ i, we will use one of the ultrafilters from the set M = ker An+i \ ((Sn U Tn) \ C*). Put v = # ( M ) . Obviously, v > 7 1 + 73. If M contains an A i+i-special ultrafilter, then one constructs 5n+ i,T n+i in an evident way. 8, in the construction of £n+ i , r n+i we can use *4n+i-similar ultrafilters q and r such that q G M , and if r e S n} then either tn(r) < 4 or tn(r) > 4 and r G K 2q. If Ln(r) > 4, then it is easy to construct Sn+i and Tn+i after having turned the bush KfQ over.

Au l < ni and the following hold: (a) Si = s^. for all i < Z; (b) n(s) < 2 for all s £ Si. Put s (I+1) = {«i+1. •• H = s « +v\(SiUTi). It is clear that # ( f f ) > #(Si \ 5 (i+1)) + # ( { s € St n S I H(s) = 2} ) . Denote by s*+i some ,4j+i-special ultrafilter in H. 34. 49 4. FINITE SEQUENCES OF ALGEBRAS (1) q € H. 8, we will assume that there are two possible cases: ( 1) r t S u (2) r e Si ns (/+1) and ti(r) = 1. In the first case, put s/+i = q, ti+i = r. In the second one, put si+i = r, 1 = q.

37n) *^3m+l • Then either Q D {a j,^ }, Q n { b \ ,b % } = 0 , Q —^ { ^ í >^2 } » Q n { a j , a^} = 0 . or 5The proof of our theorem also contains the construction of other algebras. All of them contain X . 4-similar sets. 4. FINITE SEQUENCES OF ALGEBRAS (1) 52 This implies that either QD{al, a%} , Qn{bf,bl} = 0 , QD{bl,b%}, Qn{ala%} = 0 , or etc. This implies that Q e ^ L + i - a contradiction. Now we construct the algebras Azrn+u *A3m+2 - Take q € P X \ k e r A l m+1. All *A3m+1-similar sets except {a™, a™} are ^43m+i-similar.