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Theorem count-del-same

⊦ count(a, bag -- a) = count(a, bag) - (count(a, bag) = 0 ⊃ 0;1)

Type: A user defined theorem
Validity: The proof is valid.
Features: ls,
Comment:
Used by: bag-swap-del, in-mkbag-del, in-mkbag-del-two,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 1
Proof steps: 5
Used lemmas:
Used spec theorems:
- bag-union/count-del
Used simplifier rules: