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Theorem ex-oddeven

⊦ ∃ m. m + m = n ∨ m + m + 1 = n

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 3
Proof steps: 7
Used lemmas: even, even-06, eq-01, succ, c, a, oz,
Used spec theorems:
- Used simplifier rules: