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| Mirrors > Home > MPE Home > Th. List > ideq | Structured version Visualization version GIF version | ||
| Description: For sets, the identity relation is the same as equality. (Contributed by NM, 13-Aug-1995.) |
| Ref | Expression |
|---|---|
| ideq.1 | ⊢ 𝐵 ∈ V |
| Ref | Expression |
|---|---|
| ideq | ⊢ (𝐴 I 𝐵 ↔ 𝐴 = 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ideq.1 | . 2 ⊢ 𝐵 ∈ V | |
| 2 | ideqg 5842 | . 2 ⊢ (𝐵 ∈ V → (𝐴 I 𝐵 ↔ 𝐴 = 𝐵)) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ (𝐴 I 𝐵 ↔ 𝐴 = 𝐵) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 = wceq 1570 ∈ wcel 2146 Vcvv 3458 class class class wbr 5114 I cid 5560 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-ext 2738 ax-sep 5262 ax-pr 5409 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2745 df-cleq 2758 df-clel 2841 df-ral 3083 df-rex 3093 df-rab 3420 df-v 3460 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-nul 4290 df-if 4493 df-sn 4595 df-pr 4597 df-op 4601 df-br 5115 df-opab 5179 df-id 5561 df-xp 5672 df-rel 5673 |
| This theorem is used by: cnvi 5876 dmi 5916 resieq 5994 iss 6042 elidinxp 6051 restidsing 6060 imai 6081 intasym 6120 asymref 6121 intirr 6123 poirr2 6129 xpdifid 6170 coi1 6269 dfpo2 6304 dffun2 6553 dffv2 6983 isof1oidb 7333 idssen 9003 dflt2 13191 relexpindlem 15126 ex-chn1 18718 opsrtoslem2 22244 hausdiag 23839 hauseqlcld 23840 metustid 24748 ltgov 28903 ex-id 30822 dfso2 36268 idsset 36401 dfon3 36403 elfix 36414 dffix2 36416 sscoid 36424 dffun10 36425 elfuns 36426 brsingle 36428 brapply 36449 lemsuccf 36452 dfrdg4 36464 bj-imdiridlem 37870 iss2 39034 undmrnresiss 44371 dffrege99 44729 ipo0 45199 ifr0 45200 fourierdlem42 46904 |
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