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least_twenty_one_circle_packing_in_square

Specification

What is the smallest square that can contain 21 unit circles?

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Lean 4 Statement 
theorem least_twenty_one_circle_packing_in_square :
    IsLeast {x : ℝ | Nonempty (Packing 21 UnitCircle (Square x))} answer(sorry)
ID: Wikipedia__SquarePacking__least_twenty_one_circle_packing_in_square
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