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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 1990 | . 2 ⊢ (𝑥 = 𝑦 → (𝑧 ∈ 𝑥 → 𝑧 ∈ 𝑦)) | |
2 | ax9 1990 | . . 3 ⊢ (𝑦 = 𝑥 → (𝑧 ∈ 𝑦 → 𝑧 ∈ 𝑥)) | |
3 | 2 | equcoms 1934 | . 2 ⊢ (𝑥 = 𝑦 → (𝑧 ∈ 𝑦 → 𝑧 ∈ 𝑥)) |
4 | 1, 3 | impbid 201 | 1 ⊢ (𝑥 = 𝑦 → (𝑧 ∈ 𝑥 ↔ 𝑧 ∈ 𝑦)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 195 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-9 1986 |
This theorem depends on definitions: df-bi 196 df-an 385 df-ex 1696 |
This theorem is referenced by: ax12wdemo 1999 dveel2 2359 elsb4 2423 axext3 2592 axext3ALT 2593 axext4 2594 bm1.1 2595 axrep1 4700 axrep2 4701 axrep3 4702 axrep4 4703 bm1.3ii 4712 nalset 4723 fv3 6116 zfun 6848 tz7.48lem 7423 aceq0 8824 dfac2a 8835 axdc3lem2 9156 zfac 9165 nd2 9289 nd3 9290 axrepndlem2 9294 axunndlem1 9296 axunnd 9297 axpowndlem2 9299 axpowndlem3 9300 axpowndlem4 9301 axpownd 9302 axregndlem2 9304 axregnd 9305 axinfndlem1 9306 axacndlem5 9312 zfcndrep 9315 zfcndun 9316 zfcndac 9320 axgroth4 9533 nqereu 9630 mdetunilem9 20245 neiptopnei 20746 2ndc1stc 21064 kqt0lem 21349 regr1lem2 21353 nrmr0reg 21362 hauspwpwf1 21601 dya2iocuni 29672 erdsze 30438 untsucf 30841 untangtr 30845 dfon2lem3 30934 dfon2lem6 30937 dfon2lem7 30938 dfon2lem8 30939 dfon2 30941 axext4dist 30950 distel 30953 axextndbi 30954 fness 31514 fneref 31515 bj-elequ2g 31853 bj-elequ12 31855 bj-axext3 31957 bj-axrep1 31976 bj-axrep2 31977 bj-axrep3 31978 bj-axrep4 31979 bj-nalset 31982 bj-eleq2w 32041 bj-axsep2 32113 matunitlindflem1 32575 prtlem13 33171 prtlem15 33178 prtlem17 33179 dveel2ALT 33242 ax12el 33245 aomclem8 36649 elintima 36964 axc11next 37629 |
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