Arrangements of Pseudocircles: Triangles and Drawings

A pseudocircle is a simple closed curve on the sphere or in the plane. The study of arrangements of pseudocircles was initiated by Grünbaum, who defined them as collections of simple closed curves that pairwise intersect in exactly two crossings. Grünbaum conjectured that the number of triangular cells [Formula: see text] in digon-free arrangements of n pairwise intersecting pseudocircles is at least [Formula: see text] . We present examples to disprove this conjecture. With a recursive construction based on an example with 12 pseudocircles and 16 triangles we obtain a family of intersecting digon-free arrangements with [Formula: see text] . We expect that the lower bound [Formula: see text] is tight for infinitely many simple arrangements. It may however be true that all digon-free arrangements of n pairwise intersecting circles have at least [Formula: see text] triangles. For pairwise intersecting arrangements with digons we have a lower bound of [Formula: see text] , and conjecture that [Formula: see text] . Concerning the maximum number of triangles in pairwise intersecting arrangements of pseudocircles, we show that [Formula: see text] . This is essentially best possible because there are families of pairwise intersecting arrangements of n pseudocircles with [Formula: see text] . The paper contains many drawings of arrangements of pseudocircles and a good fraction of these drawings was produced automatically from the combinatorial data produced by our generation algorithm. In the final section we describe some aspects of the drawing algorithm.