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Theorem size-del-leq

⊦ # s ≤ #(s -- a) ↔ ¬ a ∈ s

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by:
Used by units in proved state: ostore, oset,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 1
Used lemmas: del-in, del-size,
Used spec theorems:
- Used simplifier rules: