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Mirrors > Home > ILE Home > Th. List > add42i | GIF version |
Description: Rearrangement of 4 terms in a sum. (Contributed by NM, 22-Aug-1999.) |
Ref | Expression |
---|---|
add.1 | ⊢ 𝐴 ∈ ℂ |
add.2 | ⊢ 𝐵 ∈ ℂ |
add.3 | ⊢ 𝐶 ∈ ℂ |
add4.4 | ⊢ 𝐷 ∈ ℂ |
Ref | Expression |
---|---|
add42i | ⊢ ((𝐴 + 𝐵) + (𝐶 + 𝐷)) = ((𝐴 + 𝐶) + (𝐷 + 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | add.1 | . . 3 ⊢ 𝐴 ∈ ℂ | |
2 | add.2 | . . 3 ⊢ 𝐵 ∈ ℂ | |
3 | add.3 | . . 3 ⊢ 𝐶 ∈ ℂ | |
4 | add4.4 | . . 3 ⊢ 𝐷 ∈ ℂ | |
5 | 1, 2, 3, 4 | add4i 7927 | . 2 ⊢ ((𝐴 + 𝐵) + (𝐶 + 𝐷)) = ((𝐴 + 𝐶) + (𝐵 + 𝐷)) |
6 | 2, 4 | addcomi 7906 | . . 3 ⊢ (𝐵 + 𝐷) = (𝐷 + 𝐵) |
7 | 6 | oveq2i 5785 | . 2 ⊢ ((𝐴 + 𝐶) + (𝐵 + 𝐷)) = ((𝐴 + 𝐶) + (𝐷 + 𝐵)) |
8 | 5, 7 | eqtri 2160 | 1 ⊢ ((𝐴 + 𝐵) + (𝐶 + 𝐷)) = ((𝐴 + 𝐶) + (𝐷 + 𝐵)) |
Colors of variables: wff set class |
Syntax hints: = wceq 1331 ∈ wcel 1480 (class class class)co 5774 ℂcc 7618 + caddc 7623 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-addcl 7716 ax-addcom 7720 ax-addass 7722 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-rex 2422 df-v 2688 df-un 3075 df-sn 3533 df-pr 3534 df-op 3536 df-uni 3737 df-br 3930 df-iota 5088 df-fv 5131 df-ov 5777 |
This theorem is referenced by: (None) |
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