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Theorem del-exists

a ∈ st ⊦ ∃ st0. ¬ a ∈ st0 ∧ st = st0[a, st[a]]

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 9
Proof steps: 19
Used lemmas: rew, insins, In-insert, At-same, At-other, In-empty,
Used spec theorems:
- Used simplifier rules: