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| Mirrors > Home > ILE Home > Th. List > uneq1d | GIF version | ||
| Description: Deduction adding union to the right in a class equality. (Contributed by NM, 29-Mar-1998.) |
| Ref | Expression |
|---|---|
| uneq1d.1 | ⊢ (𝜑 → 𝐴 = 𝐵) |
| Ref | Expression |
|---|---|
| uneq1d | ⊢ (𝜑 → (𝐴 ∪ 𝐶) = (𝐵 ∪ 𝐶)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | uneq1d.1 | . 2 ⊢ (𝜑 → 𝐴 = 𝐵) | |
| 2 | uneq1 3376 | . 2 ⊢ (𝐴 = 𝐵 → (𝐴 ∪ 𝐶) = (𝐵 ∪ 𝐶)) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → (𝐴 ∪ 𝐶) = (𝐵 ∪ 𝐶)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 = wceq 1402 ∪ cun 3218 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-v 2823 df-un 3224 |
| This theorem is used by: ifeq1 3643 preq1 3788 tpeq1 3797 tpeq2 3798 resasplitss 5569 fmptpr 5907 funresdfunsnss 5918 rdgisucinc 6656 oasuc 6737 omsuc 6745 funresdfunsndc 6779 fisseneq 7242 sbthlemi5 7278 exmidfodomrlemim 7553 fzpred 10477 fseq1p1m1 10501 nn0split 10543 nnsplit 10544 fzo0sn0fzo1 10639 fzosplitpr 10652 fzosplitprm1 10653 zsupcllemstep 10662 hashfibclem 11282 fsum1p 12185 fprod1p 12366 setsvala 13383 setsabsd 13391 setscom 13392 prdsex 14172 prdsval 14173 plyaddlem1 15848 plymullem1 15849 birthdaylem2 16088 |
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