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Proof step 50 from proof euler-four-square-identity2 (previous step)

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

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: int-mult inst: name: dist-lsplit seq: ⊦ (i + i0) * j = i * j + i0 * j subst: [j, i0, i] → [i3 * j1 + i4 * j2, i2 * j4, i1 * j3] flags: rewrite

Additional information

Used terms: i3 * j1 + i4 * j2, i2 * j4, i1 * j3