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theorem proved term proof

cascadeStep_subset

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formal statement (Lean)

 141theorem cascadeStep_subset {n : ℕ} (E : Ecosystem n) (L : Finset (Fin n)) :
 142    cascadeStep E L ⊆ L := by

proof body

Term-mode proof.

 143  unfold cascadeStep
 144  exact Finset.filter_subset _ _
 145
 146/-- Each cascade step weakly shrinks the live set. -/

used by (4)

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depends on (6)

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