OFFSET
3,2
REFERENCES
P. Erdős and G. Purdy, Extremal problems in combinatorial geometry, Chapter 17 in Handbook of Combinatorics, North-Holland '95, p. 848.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
The article by Erdős and Purdy incorrectly says (on p. 847) that each circle must contain a pair of the points.
STATUS
approved