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Theorem two-even

⊦ 2 * i = j1 ^2 + j2 ^2 → i = ((j1 - j2) / 2)^2 + ((j1 + j2) / 2)^2

Type: A user defined theorem
Validity: The proof is valid.
Features:
Comment:
Used by: two-even-01, two-ex,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 29
Proof steps: 48
Used lemmas: zero, two-mult, one, neq, Square-def, two-plus,
Used spec theorems:
Used simplifier rules: