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Mirrors > Home > MPE Home > Th. List > elequ2 | Structured version Visualization version GIF version |
Description: An identity law for the non-logical predicate. (Contributed by NM, 21-Jun-1993.) |
Ref | Expression |
---|---|
elequ2 | ⊢ (𝑥 = 𝑦 → (𝑧 ∈ 𝑥 ↔ 𝑧 ∈ 𝑦)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax9 2125 | . 2 ⊢ (𝑥 = 𝑦 → (𝑧 ∈ 𝑥 → 𝑧 ∈ 𝑦)) | |
2 | ax9 2125 | . . 3 ⊢ (𝑦 = 𝑥 → (𝑧 ∈ 𝑦 → 𝑧 ∈ 𝑥)) | |
3 | 2 | equcoms 2027 | . 2 ⊢ (𝑥 = 𝑦 → (𝑧 ∈ 𝑦 → 𝑧 ∈ 𝑥)) |
4 | 1, 3 | impbid 215 | 1 ⊢ (𝑥 = 𝑦 → (𝑧 ∈ 𝑥 ↔ 𝑧 ∈ 𝑦)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-9 2121 |
This theorem depends on definitions: df-bi 210 df-an 400 df-ex 1782 |
This theorem is referenced by: elsb4 2127 elequ2g 2128 ax12wdemo 2136 dveel2 2474 axextg 2772 axextmo 2774 eleq2w 2873 nfcvf 2981 axrep1 5155 axreplem 5156 axrep4 5159 axsepg 5168 bm1.3ii 5170 nalset 5181 fv3 6663 zfun 7442 tz7.48lem 8060 aceq1 9528 aceq0 9529 aceq2 9530 dfac2a 9540 kmlem4 9564 axdc3lem2 9862 zfac 9871 nd2 9999 nd3 10000 axrepndlem2 10004 axunndlem1 10006 axunnd 10007 axpowndlem2 10009 axpowndlem3 10010 axpowndlem4 10011 axpownd 10012 axregndlem2 10014 axregnd 10015 axinfndlem1 10016 axacndlem5 10022 zfcndrep 10025 zfcndun 10026 zfcndac 10030 axgroth4 10243 nqereu 10340 elnpi 10399 mdetunilem9 21225 neiptopnei 21737 2ndc1stc 22056 restlly 22088 kqt0lem 22341 regr1lem2 22345 nrmr0reg 22354 hauspwpwf1 22592 dya2iocuni 31651 erdsze 32562 untsucf 33049 untangtr 33053 dfon2lem3 33143 dfon2lem6 33146 dfon2lem7 33147 dfon2lem8 33148 dfon2 33150 axextbdist 33158 distel 33161 axextndbi 33162 fness 33810 fneref 33811 bj-elequ12 34125 bj-axc14nf 34294 bj-bm1.3ii 34481 matunitlindflem1 35053 prtlem13 36164 prtlem15 36171 prtlem17 36172 dveel2ALT 36235 ax12el 36238 aomclem8 40005 elintima 40354 mnuprdlem3 40982 axc11next 41110 |
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