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Mirrors > Home > MPE Home > Th. List > uneq1 | Structured version Visualization version GIF version |
Description: Equality theorem for the union of two classes. (Contributed by NM, 15-Jul-1993.) |
Ref | Expression |
---|---|
uneq1 | ⊢ (𝐴 = 𝐵 → (𝐴 ∪ 𝐶) = (𝐵 ∪ 𝐶)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq2 2690 | . . . 4 ⊢ (𝐴 = 𝐵 → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)) | |
2 | 1 | orbi1d 739 | . . 3 ⊢ (𝐴 = 𝐵 → ((𝑥 ∈ 𝐴 ∨ 𝑥 ∈ 𝐶) ↔ (𝑥 ∈ 𝐵 ∨ 𝑥 ∈ 𝐶))) |
3 | elun 3753 | . . 3 ⊢ (𝑥 ∈ (𝐴 ∪ 𝐶) ↔ (𝑥 ∈ 𝐴 ∨ 𝑥 ∈ 𝐶)) | |
4 | elun 3753 | . . 3 ⊢ (𝑥 ∈ (𝐵 ∪ 𝐶) ↔ (𝑥 ∈ 𝐵 ∨ 𝑥 ∈ 𝐶)) | |
5 | 2, 3, 4 | 3bitr4g 303 | . 2 ⊢ (𝐴 = 𝐵 → (𝑥 ∈ (𝐴 ∪ 𝐶) ↔ 𝑥 ∈ (𝐵 ∪ 𝐶))) |
6 | 5 | eqrdv 2620 | 1 ⊢ (𝐴 = 𝐵 → (𝐴 ∪ 𝐶) = (𝐵 ∪ 𝐶)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∨ wo 383 = wceq 1483 ∈ wcel 1990 ∪ cun 3572 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-v 3202 df-un 3579 |
This theorem is referenced by: uneq2 3761 uneq12 3762 uneq1i 3763 uneq1d 3766 unineq 3877 prprc1 4300 uniprg 4450 relresfld 5662 unexb 6958 oarec 7642 xpider 7818 ralxpmap 7907 undifixp 7944 unxpdom 8167 enp1ilem 8194 findcard2 8200 domunfican 8233 pwfilem 8260 fin1a2lem10 9231 incexclem 14568 lcmfunsnlem 15354 ramub1lem1 15730 ramub1 15732 mreexexlem3d 16306 mreexexlem4d 16307 ipodrsima 17165 mplsubglem 19434 mretopd 20896 iscldtop 20899 nconnsubb 21226 plyval 23949 spanun 28404 difeq 29355 unelldsys 30221 isros 30231 unelros 30234 difelros 30235 rossros 30243 measun 30274 inelcarsg 30373 actfunsnf1o 30682 actfunsnrndisj 30683 mrsubvrs 31419 altopthsn 32068 rankung 32273 poimirlem28 33437 islshp 34266 lshpset2N 34406 paddval 35084 nacsfix 37275 eldioph4b 37375 eldioph4i 37376 diophren 37377 clsk3nimkb 38338 isotone1 38346 compneOLD 38644 fiiuncl 39234 founiiun0 39377 infxrpnf 39674 meadjun 40679 hoidmvle 40814 |
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