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Theorem add42d 8189
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 8181 . 2 (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) ∧ (𝐶 ∈ ℂ ∧ 𝐷 ∈ ℂ)) → ((𝐴 + 𝐵) + (𝐶 + 𝐷)) = ((𝐴 + 𝐶) + (𝐷 + 𝐵)))
61, 2, 3, 4, 5syl22anc 1250 1 (𝜑 → ((𝐴 + 𝐵) + (𝐶 + 𝐷)) = ((𝐴 + 𝐶) + (𝐷 + 𝐵)))
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1364  wcel 2164  (class class class)co 5918  cc 7870   + caddc 7875
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 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-ext 2175  ax-addcl 7968  ax-addcom 7972  ax-addass 7974
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1472  df-sb 1774  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-rex 2478  df-v 2762  df-un 3157  df-sn 3624  df-pr 3625  df-op 3627  df-uni 3836  df-br 4030  df-iota 5215  df-fv 5262  df-ov 5921
This theorem is referenced by:  remullem  11015  mul4sqlem  12531
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