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Mirrors > Home > MPE Home > Th. List > elequ1 | Structured version Visualization version GIF version |
Description: An identity law for the non-logical predicate. (Contributed by NM, 30-Jun-1993.) |
Ref | Expression |
---|---|
elequ1 | ⊢ (𝑥 = 𝑦 → (𝑥 ∈ 𝑧 ↔ 𝑦 ∈ 𝑧)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax8 2116 | . 2 ⊢ (𝑥 = 𝑦 → (𝑥 ∈ 𝑧 → 𝑦 ∈ 𝑧)) | |
2 | ax8 2116 | . . 3 ⊢ (𝑦 = 𝑥 → (𝑦 ∈ 𝑧 → 𝑥 ∈ 𝑧)) | |
3 | 2 | equcoms 2023 | . 2 ⊢ (𝑥 = 𝑦 → (𝑦 ∈ 𝑧 → 𝑥 ∈ 𝑧)) |
4 | 1, 3 | impbid 214 | 1 ⊢ (𝑥 = 𝑦 → (𝑥 ∈ 𝑧 ↔ 𝑦 ∈ 𝑧)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1777 |
This theorem is referenced by: elsb3 2118 cleljust 2119 ax12wdemo 2135 cleljustALT 2378 cleljustALT2 2379 dveel1 2480 axc14 2482 axsepgfromrep 5194 nalset 5210 zfpow 5260 zfun 7456 tz7.48lem 8071 unxpdomlem1 8716 pssnn 8730 zfinf 9096 aceq1 9537 aceq0 9538 aceq2 9539 dfac3 9541 dfac5lem2 9544 dfac5lem3 9545 dfac2a 9549 kmlem4 9573 zfac 9876 nd1 10003 axextnd 10007 axrepndlem1 10008 axrepndlem2 10009 axunndlem1 10011 axunnd 10012 axpowndlem2 10014 axpowndlem3 10015 axpowndlem4 10016 axregndlem1 10018 axregnd 10020 zfcndun 10031 zfcndpow 10032 zfcndinf 10034 zfcndac 10035 fpwwe2lem12 10057 axgroth3 10247 axgroth4 10248 nqereu 10345 mdetunilem9 21223 madugsum 21246 neiptopnei 21734 2ndc1stc 22053 nrmr0reg 22351 alexsubALTlem4 22652 xrsmopn 23414 itg2cn 24358 itgcn 24437 sqff1o 25753 dya2iocuni 31536 bnj849 32192 erdsze 32444 untsucf 32931 untangtr 32935 dfon2lem3 33025 dfon2lem6 33028 dfon2lem7 33029 dfon2 33032 axextdist 33039 distel 33043 neibastop2lem 33703 bj-elequ12 34007 bj-nfeel2 34173 bj-ru0 34248 prtlem5 35990 prtlem13 35998 prtlem16 35999 ax12el 36072 pw2f1ocnv 39627 aomclem8 39654 grumnud 40615 lcosslsp 44486 |
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