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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 5829 | . 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 2145 Vcvv 3451 class class class wbr 5103 I cid 5545 |
| 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 2147 ax-9 2155 ax-ext 2733 ax-sep 5249 ax-pr 5391 |
| 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 2740 df-cleq 2753 df-clel 2836 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-br 5104 df-opab 5168 df-id 5546 df-xp 5657 df-rel 5658 |
| This theorem is used by: cnvi 5863 dmi 5903 resieq 5981 iss 6029 elidinxp 6038 restidsing 6047 imai 6068 intasym 6107 asymref 6108 intirr 6110 poirr2 6116 xpdifid 6158 coi1 6257 dfpo2 6292 dffun2 6541 dffv2 6972 isof1oidb 7324 idssen 9008 dflt2 13258 relexpindlem 15196 ex-chn1 18791 opsrtoslem2 22345 hausdiag 23944 hauseqlcld 23945 metustid 24853 ltgov 29042 ex-id 31017 dfso2 36489 idsset 36622 dfon3 36624 elfix 36635 dffix2 36637 sscoid 36645 dffun10 36646 elfuns 36647 brsingle 36649 brapply 36670 lemsuccf 36673 dfrdg4 36685 bj-imdiridlem 38074 iss2 39244 undmrnresiss 44563 dffrege99 44921 ipo0 45391 ifr0 45392 fourierdlem42 47103 |
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