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Theorem del-three

⊦ 2 < # s → #(s -- a -- a0) ≠ 0

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 1
Proof steps: 7
Used lemmas: del-in-01, del-in, del-addeq-04, Delete, del-feq, one-min, del-e-01, del-addeq-05, del-e-02,
Used spec theorems:
- set-basic/indef
Used simplifier rules: