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Theorem size

⊦ a ∈ st → #(st -- a) = (# st)-1

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 2
Proof steps: 5
Used lemmas: Size-insert, Del-in, deldel, insert, indef-01,
Used spec theorems:
- Used simplifier rules: