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erdos_503.variants.R2

Specification

When $n = 2$, the answer is 6 (due to Kelly [ErKe47] - an alternative proof is given by Kovács [Ko24c]). [ErKe47] Erdős, Paul and Kelly, L. M., Elementary Problems and Solutions: Solutions: E735. Amer. Math. Monthly (1947), 227-229. [Ko24c] Z. Kovács, A note on Erdős's mysterious remark. arXiv:2412.05190 (2024).

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Lean 4 Statement 
theorem erdos_503.variants.R2 :
    IsGreatest {(A.ncard) | (A : Set ℝ²) (hA : A.IsIsosceles)} 6
ID: ErdosProblems__503__erdos_503.variants.R2
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