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International Journal of Mathematics and Mathematical Sciences
Volume 25 (2001), Issue 11, Pages 693-701

The number of connected components of certain real algebraic curves

School of Mathematical Sciences, Seoul National University, Seoul 151-742, South Korea

Received 7 June 2000; Revised 7 August 2000

Copyright © 2001 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


For an integer n2, let p(z)=k=1n(zαk) and q(z)=k=1n(zβk), where αk,βk are real. We find the number of connected components of the real algebraic curve {(x,y)2:|p(x+iy)||q(x+iy)|=0} for some αk and βk. Moreover, in these cases, we show that each connected component contains zeros of p(z)+q(z), and we investigate the locus of zeros of p(z)+q(z).