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Theorem size-one

⊦ # s = 1 → (∃ a. s = ∅ ++ a)

Type: A user defined theorem
Validity: The proof is valid.
Features:
Comment:
Used by: size-one-03, size-two,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 4
Proof steps: 10
Used lemmas: alle, Size-empty, size-zero-02, rax, Size-insert, indef, ne-02, ne-01, size-one-02, In-empty, sel, in-04, Extension,
Used spec theorems:
- Used simplifier rules: