Research notes on every problem, and a library of the papers behind them. Built from the open erdos repository.
Updated
Claim. Tao Hu and Quanyu Tang, Counterexamples for Problem #1045 (version 1.0, 3 October 2025), exhibit the kite , whose ordered product exceeds the square's , and an explicit six-point set of diameter , given in eight-decimal coordinates and checked by computer, whose ordered product is about , above the regular hexagon's . So the regular polygon does not maximize the product of Problem 1045 at or . The note reports numerical evidence that the regular pentagon is optimal at and makes no claim for odd .
Covers. A negative answer to the regular-polygon question at and . Both cases were already settled by Danzer and Pommerenke in 1967.
Depends on. No page of this wiki.
Standing. A note posted on GitHub and linked from the site's thread on 3 October 2025; it has no journal publication. The site's commentary credits the examples, but the site labels the problem OPEN, so the credit is not review.