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least_fifteen_circle_packing_in_circle

Specification

What is the smallest circle that can contain 15 unit circles? Reference: Graham RL, Lubachevsky BD, Nurmela KJ, Ostergard PRJ. Dense packings of congruent circles in a circle. Discrete Math 1998;181:139–154.

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Lean 4 Statement 
theorem least_fifteen_circle_packing_in_circle :
    IsLeast {r : ℝ | Nonempty (Packing 15 UnitCircle (Circle r))} answer(sorry)
ID: Wikipedia__SquarePacking__least_fifteen_circle_packing_in_circle
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