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Proof step 21 from proof even-sum (previous step)

even(i1) ∧ even(i2) ∨ odd(i1) ∧ odd(i2), even(i) ∧ even(i0) ∨ odd(i) ∧ odd(i0) ⊦ even(i + i0) ∧ even(i1 + i2)

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: int-min inst: name: even-add seq: ⊦ even(i + j) ↔ even(i) ∧ even(j) ∨ odd(i) ∧ odd(j) subst: [j, i] → [i0, i] flags: rewrite

Additional information

Used terms: i0, i