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erdos_503.variants.R3

Specification

When $n = 3$, the answer is 8 (due to Croft [Cr62]). [Cr62] Croft, H. T., $9$-point and $7$-point configurations in $3$-space. Proc. London Math. Soc. (3) (1962), 400-424.

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Lean 4 Statement 
theorem erdos_503.variants.R3 :
    IsGreatest {(A.ncard) | (A : Set ℝ³) (hA : A.IsIsosceles)} 8
ID: ErdosProblems__503__erdos_503.variants.R3
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