By Andrew H. Wallace

Proceeding from the view of topology as a sort of geometry, Wallace emphasizes geometrical motivations and interpretations. as soon as past the singular homology teams, although, the writer advances an figuring out of the subject's algebraic styles, leaving geometry apart as a way to research those styles as natural algebra. various workouts seem in the course of the textual content. as well as constructing scholars' pondering by way of algebraic topology, the workouts additionally unify the textual content, given that a lot of them function effects that seem in later expositions. vast appendixes provide important stories of heritage material.

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**Example text**

Q1PQ2 = 0. Let us denote by d1 and d2 the distances of Q1 and Q2 from P respectively and by w the angle formed by the ray PQ1 with the positive real axis. Also let us define k1 = [(s - tl)/d1]P+a and k2 = [(s Then, since Ikll _ jk21 = 1, arg k1 = (p + q)a' t2)/d2]D+ae4'. SOME GENERALIZATIONS [§81 33 and argk2=(p+q)(w+0)+y=rr+(p+q)w, the vectors k1 and k2 are equal and opposite and thus k1+k2=0. This means that the function G(z) = [d°z(z - t1)D/di(z - t2)°] + el"[di(z - t2)D/dz(z - tl)Q] has a zero at the point s.

9,2) and which may be established with the aid of ex. (8,6) and of the method of proof used for Th. (9,2). Th. (9,4) is due to Marden [20]. EXERCISES. Prove the following. 1. If in eq. (9,6) y = 0 and if all the a; lie on a segment a of the real axis, the zeros of every Stieltjes polynomial will also lie on a [Stieltjes 2]. 2. Under the hypothesis of ex. 1, the zeros of every Van Vleck polynomial will also lie on a [Van Vleck I]. 3. If y = 0, any convex region K containing all the points a, will also contain all the zeros of every Stieltjes polynomial [Bocher 1, Klein 1, and Pdlya 11.

Let I: a < x < # be an interval of the real axis such that neither a nor fi is a zero of f(z) or an interior point of any circle K(c, , ,u). Let N be the configuration comprised of I and all the circles K(c, , u,) which intersect I. Then, if N contains v zeros of f(z), it contains at least v - I and at most v + I zeros of fl(z) [Marden 17]. 9. ,q-1 Jktl(Z) fk(Z) =r ( Yjk j==lZ - CA + Yjk Z - Cjk ) + n_k I Yjk j=2pk+l Z - Cjk where larg Yjkl < wk < 7r/2 for j = 1, 2, , n - k and yjk and Cjk are real for j > 2pk .