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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 5835 | . 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 3453 class class class wbr 5107 I cid 5553 |
| 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 2734 ax-sep 5255 ax-pr 5402 |
| 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 2741 df-cleq 2754 df-clel 2837 df-ral 3079 df-rex 3089 df-rab 3415 df-v 3455 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4283 df-if 4486 df-sn 4588 df-pr 4590 df-op 4594 df-br 5108 df-opab 5172 df-id 5554 df-xp 5665 df-rel 5666 |
| This theorem is used by: cnvi 5869 dmi 5909 resieq 5987 iss 6035 elidinxp 6044 restidsing 6053 imai 6074 intasym 6113 asymref 6114 intirr 6116 poirr2 6122 xpdifid 6164 coi1 6263 dfpo2 6298 dffun2 6547 dffv2 6977 isof1oidb 7329 idssen 9007 dflt2 13203 relexpindlem 15140 ex-chn1 18731 opsrtoslem2 22278 hausdiag 23877 hauseqlcld 23878 metustid 24786 ltgov 28947 ex-id 30922 dfso2 36342 idsset 36475 dfon3 36477 elfix 36488 dffix2 36490 sscoid 36498 dffun10 36499 elfuns 36500 brsingle 36502 brapply 36523 lemsuccf 36526 dfrdg4 36538 bj-imdiridlem 37945 iss2 39100 undmrnresiss 44452 dffrege99 44810 ipo0 45280 ifr0 45281 fourierdlem42 46985 |
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