Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
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 2128 | . 2 ⊢ (𝑥 = 𝑦 → (𝑧 ∈ 𝑥 → 𝑧 ∈ 𝑦)) | |
2 | ax9 2128 | . . 3 ⊢ (𝑦 = 𝑥 → (𝑧 ∈ 𝑦 → 𝑧 ∈ 𝑥)) | |
3 | 2 | equcoms 2027 | . 2 ⊢ (𝑥 = 𝑦 → (𝑧 ∈ 𝑦 → 𝑧 ∈ 𝑥)) |
4 | 1, 3 | impbid 214 | 1 ⊢ (𝑥 = 𝑦 → (𝑧 ∈ 𝑥 ↔ 𝑧 ∈ 𝑦)) |
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 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-9 2124 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1781 |
This theorem is referenced by: elsb4 2130 elequ2g 2131 ax12wdemo 2139 dveel2 2485 axextg 2797 axextmo 2799 eleq2w 2898 nfcvf 3009 axrep1 5193 axreplem 5194 axrep4 5197 axsepg 5206 bm1.3ii 5208 nalset 5219 fv3 6690 zfun 7464 tz7.48lem 8079 aceq1 9545 aceq0 9546 aceq2 9547 dfac2a 9557 kmlem4 9581 axdc3lem2 9875 zfac 9884 nd2 10012 nd3 10013 axrepndlem2 10017 axunndlem1 10019 axunnd 10020 axpowndlem2 10022 axpowndlem3 10023 axpowndlem4 10024 axpownd 10025 axregndlem2 10027 axregnd 10028 axinfndlem1 10029 axacndlem5 10035 zfcndrep 10038 zfcndun 10039 zfcndac 10043 axgroth4 10256 nqereu 10353 mdetunilem9 21231 neiptopnei 21742 2ndc1stc 22061 restlly 22093 kqt0lem 22346 regr1lem2 22350 nrmr0reg 22359 hauspwpwf1 22597 dya2iocuni 31543 erdsze 32451 untsucf 32938 untangtr 32942 dfon2lem3 33032 dfon2lem6 33035 dfon2lem7 33036 dfon2lem8 33037 dfon2 33039 axextbdist 33047 distel 33050 axextndbi 33051 fness 33699 fneref 33700 bj-elequ12 34014 bj-axc14nf 34181 bj-bm1.3ii 34359 matunitlindflem1 34890 prtlem13 36006 prtlem15 36013 prtlem17 36014 dveel2ALT 36077 ax12el 36080 aomclem8 39668 elintima 40005 mnuprdlem3 40617 axc11next 40745 |
Copyright terms: Public domain | W3C validator |