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Theorem add42d 8439
Description: Rearrangement of 4 terms in a sum. (Contributed by Mario Carneiro, 27-May-2016.)
Hypotheses
Ref Expression
addd.1 (𝜑𝐴 ∈ ℂ)
addd.2 (𝜑𝐵 ∈ ℂ)
addd.3 (𝜑𝐶 ∈ ℂ)
add4d.4 (𝜑𝐷 ∈ ℂ)
Assertion
Ref Expression
add42d (𝜑 → ((𝐴 + 𝐵) + (𝐶 + 𝐷)) = ((𝐴 + 𝐶) + (𝐷 + 𝐵)))

Proof of Theorem add42d
StepHypRef Expression
1 addd.1 . 2 (𝜑𝐴 ∈ ℂ)
2 addd.2 . 2 (𝜑𝐵 ∈ ℂ)
3 addd.3 . 2 (𝜑𝐶 ∈ ℂ)
4 add4d.4 . 2 (𝜑𝐷 ∈ ℂ)
5 add42 8431 . 2 (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) ∧ (𝐶 ∈ ℂ ∧ 𝐷 ∈ ℂ)) → ((𝐴 + 𝐵) + (𝐶 + 𝐷)) = ((𝐴 + 𝐶) + (𝐷 + 𝐵)))
61, 2, 3, 4, 5syl22anc 1275 1 (𝜑 → ((𝐴 + 𝐵) + (𝐶 + 𝐷)) = ((𝐴 + 𝐶) + (𝐷 + 𝐵)))
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1398  wcel 2203  (class class class)co 6049  cc 8121   + caddc 8126
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2214  ax-addcl 8219  ax-addcom 8223  ax-addass 8225
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-rex 2526  df-v 2814  df-un 3214  df-sn 3694  df-pr 3695  df-op 3697  df-uni 3914  df-br 4109  df-iota 5311  df-fv 5359  df-ov 6052
This theorem is referenced by:  remullem  11549  mul4sqlem  13084
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