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theorem proved term proof

wallpaper_groups_count

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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)

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