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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 2119 | . 2 ⊢ (𝑥 = 𝑦 → (𝑥 ∈ 𝑧 → 𝑦 ∈ 𝑧)) | |
2 | ax8 2119 | . . 3 ⊢ (𝑦 = 𝑥 → (𝑦 ∈ 𝑧 → 𝑥 ∈ 𝑧)) | |
3 | 2 | equcoms 2026 | . 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 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1780 |
This theorem is referenced by: elsb3 2121 cleljust 2122 ax12wdemo 2138 cleljustALT 2381 cleljustALT2 2382 dveel1 2483 axc14 2485 axsepgfromrep 5204 nalset 5220 zfpow 5270 zfun 7465 tz7.48lem 8080 unxpdomlem1 8725 pssnn 8739 zfinf 9105 aceq1 9546 aceq0 9547 aceq2 9548 dfac3 9550 dfac5lem2 9553 dfac5lem3 9554 dfac2a 9558 kmlem4 9582 zfac 9885 nd1 10012 axextnd 10016 axrepndlem1 10017 axrepndlem2 10018 axunndlem1 10020 axunnd 10021 axpowndlem2 10023 axpowndlem3 10024 axpowndlem4 10025 axregndlem1 10027 axregnd 10029 zfcndun 10040 zfcndpow 10041 zfcndinf 10043 zfcndac 10044 fpwwe2lem12 10066 axgroth3 10256 axgroth4 10257 nqereu 10354 mdetunilem9 21232 madugsum 21255 neiptopnei 21743 2ndc1stc 22062 nrmr0reg 22360 alexsubALTlem4 22661 xrsmopn 23423 itg2cn 24367 itgcn 24446 sqff1o 25762 dya2iocuni 31545 bnj849 32201 erdsze 32453 untsucf 32940 untangtr 32944 dfon2lem3 33034 dfon2lem6 33037 dfon2lem7 33038 dfon2 33041 axextdist 33048 distel 33052 neibastop2lem 33712 bj-elequ12 34016 bj-nfeel2 34182 bj-ru0 34257 prtlem5 36000 prtlem13 36008 prtlem16 36009 ax12el 36082 pw2f1ocnv 39640 aomclem8 39667 grumnud 40628 lcosslsp 44500 |
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