Our short note gives the affirmative answer to one of Fishburn’s questions.
@article{107806, author = {Vojtech B\'alint and Zuzana Kojdjakov\'a}, title = {Answer to one of Fishburn's questions: ``Isosceles planar subsets'' [Discrete Comput. Geom. 19 (1998), no. 3, 391--398]}, journal = {Archivum Mathematicum}, volume = {037}, year = {2001}, pages = {289-290}, zbl = {1090.52011}, mrnumber = {1879451}, language = {en}, url = {http://dml.mathdoc.fr/item/107806} }
Bálint, Vojtech; Kojdjaková, Zuzana. Answer to one of Fishburn's questions: ``Isosceles planar subsets'' [Discrete Comput. Geom. 19 (1998), no. 3, 391--398]. Archivum Mathematicum, Tome 037 (2001) pp. 289-290. http://gdmltest.u-ga.fr/item/107806/
Isosceles Planar Subsets, Discrete & Computational Geometry 19 (1998), 391–398. | MR 1608880 | Zbl 0938.52013