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Mirrors > Home > ILE Home > Th. List > difeq2i | GIF version |
Description: Inference adding difference to the left in a class equality. (Contributed by NM, 15-Nov-2002.) |
Ref | Expression |
---|---|
difeq1i.1 | ⊢ 𝐴 = 𝐵 |
Ref | Expression |
---|---|
difeq2i | ⊢ (𝐶 ∖ 𝐴) = (𝐶 ∖ 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | difeq1i.1 | . 2 ⊢ 𝐴 = 𝐵 | |
2 | difeq2 3183 | . 2 ⊢ (𝐴 = 𝐵 → (𝐶 ∖ 𝐴) = (𝐶 ∖ 𝐵)) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ (𝐶 ∖ 𝐴) = (𝐶 ∖ 𝐵) |
Colors of variables: wff set class |
Syntax hints: = wceq 1331 ∖ cdif 3063 |
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-in1 603 ax-in2 604 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-11 1484 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-ral 2419 df-rab 2423 df-dif 3068 |
This theorem is referenced by: difeq12i 3187 inssddif 3312 difdif2ss 3328 dif32 3334 difabs 3335 symdif1 3336 notrab 3348 dif0 3428 difdifdirss 3442 dfif3 3482 difpr 3657 dif1o 6328 unfiin 6807 |
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