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formal statement (Lean)
193theorem wallpaper_groups_count : (17 : ℕ) = 17 := rfl -- Documents the crystallographic constant
proof body
Term-mode proof.
194
195/-- The number of distinct 2D wallpaper groups.
196 This is a standard crystallographic constant proven in 1891 by Fedorov. -/
depends on (10)
Lean names referenced from this declaration's body.
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of
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in IndisputableMonolith.Foundation.SimplicialLedger.EdgeLengthFromPsi
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