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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 5840 | . 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 5112 I cid 5558 |
| 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 5260 ax-pr 5407 |
| 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 4491 df-sn 4593 df-pr 4595 df-op 4599 df-br 5113 df-opab 5177 df-id 5559 df-xp 5670 df-rel 5671 |
| This theorem is used by: cnvi 5874 dmi 5914 resieq 5992 iss 6040 elidinxp 6049 restidsing 6058 imai 6079 intasym 6118 asymref 6119 intirr 6121 poirr2 6127 xpdifid 6168 coi1 6267 dfpo2 6301 dffun2 6550 dffv2 6980 isof1oidb 7326 idssen 8996 dflt2 13183 relexpindlem 15111 ex-chn1 18703 opsrtoslem2 22222 hausdiag 23817 hauseqlcld 23818 metustid 24726 ltgov 28881 ex-id 30800 dfso2 36259 idsset 36392 dfon3 36394 elfix 36405 dffix2 36407 sscoid 36415 dffun10 36416 elfuns 36417 brsingle 36419 brapply 36440 lemsuccf 36443 dfrdg4 36455 bj-imdiridlem 37861 iss2 39025 undmrnresiss 44362 dffrege99 44720 ipo0 45190 ifr0 45191 fourierdlem42 46895 |
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