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Theorem sum-swap

⊦ Σ(n, λ k0. Σ(m, λ k1. nnf(k0, k1))) = Σ(m, λ k1. Σ(n, λ k0. nnf(k0, k1)))

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 2
Proof steps: 7
Used lemmas: sum-split, sum-rec, sum-empty, sum-base,
Used spec theorems:
- Used simplifier rules: