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Theorem euler-four-square-identity2

⊦ (i1.^2 + i2.^2 + i3.^2 + i4.^2) * (j1.^2 + j2.^2 + j3.^2 + j4.^2) = (((i1 * j1 + i2 * j2) + i3 * j3) + i4 * j4).^2 + ((i1 * j2 - i2 * j1 - i3 * j4) + i4 * j3).^2 + (i1 * j3 + i2 * j4 - i3 * j1 - i4 * j2).^2 + ((i1 * j4 - i2 * j3) + i3 * j2 - i4 * j1).^2

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

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Infos about the proof

Proved?: Yes
Interactions: 72
Proof steps: 78
Used lemmas: two-plus, two-pm, two-minus,
Used spec theorems:
Used simplifier rules: