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| Mirrors > Home > MPE Home > Th. List > resiexg | Structured version Visualization version GIF version | ||
| Description: The existence of a restricted identity function, proved without using the Axiom of Replacement (unlike resfunexg 7163). (Contributed by NM, 13-Jan-2007.) (Proof shortened by Peter Mazsa, 2-Oct-2022.) |
| Ref | Expression |
|---|---|
| resiexg | ⊢ (𝐴 ∈ 𝑉 → ( I ↾ 𝐴) ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | idssxp 6008 | . 2 ⊢ ( I ↾ 𝐴) ⊆ (𝐴 × 𝐴) | |
| 2 | sqxpexg 7702 | . 2 ⊢ (𝐴 ∈ 𝑉 → (𝐴 × 𝐴) ∈ V) | |
| 3 | ssexg 5254 | . 2 ⊢ ((( I ↾ 𝐴) ⊆ (𝐴 × 𝐴) ∧ (𝐴 × 𝐴) ∈ V) → ( I ↾ 𝐴) ∈ V) | |
| 4 | 1, 2, 3 | sylancr 594 | 1 ⊢ (𝐴 ∈ 𝑉 → ( I ↾ 𝐴) ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2121 Vcvv 3433 ⊆ wss 3885 I cid 5515 × cxp 5619 ↾ cres 5623 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1975 ax-7 2016 ax-8 2123 ax-9 2131 ax-ext 2713 ax-sep 5221 ax-pow 5297 ax-pr 5365 ax-un 7682 |
| This theorem depends on definitions: df-bi 209 df-an 398 df-or 855 df-3an 1095 df-tru 1551 df-fal 1561 df-ex 1788 df-sb 2075 df-clab 2720 df-cleq 2733 df-clel 2816 df-ral 3056 df-rex 3066 df-rab 3394 df-v 3435 df-dif 3888 df-un 3890 df-in 3892 df-ss 3902 df-nul 4265 df-if 4458 df-pw 4534 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4842 df-br 5076 df-opab 5138 df-id 5516 df-xp 5627 df-rel 5628 df-res 5633 |
| This theorem is referenced by: ordiso 9425 wdomref 9481 dfac9 10054 relexp0g 14979 relexpsucnnr 14982 ndxarg 17161 idfu2nd 17839 idfu1st 17841 idfucl 17843 funcestrcsetclem4 18104 equivestrcsetc 18113 funcsetcestrclem4 18119 sursubmefmnd 18859 injsubmefmnd 18860 smndex1n0mnd 18878 islinds2 21792 pf1ind 22345 ausgrusgrb 29256 upgrres1lem1 29400 cusgrexilem1 29530 sizusglecusg 29554 pliguhgr 30579 bj-evalid 37449 bj-diagval 37549 poimirlem15 38017 xrnidresex 38812 dib0 41671 dicn0 41699 cdlemn11a 41714 dihord6apre 41763 dihatlat 41841 dihpN 41843 eldioph2lem1 43224 eldioph2lem2 43225 dfrtrcl5 44088 dfrcl2 44133 relexpiidm 44163 ushggricedg 48432 uspgrsprfo 48653 rngcidALTV 48779 ringcidALTV 48813 resipos 49479 cofidvala 49620 cofidval 49623 opf2fval 49909 fucoppc 49914 idfudiag1bas 50028 idfudiag1 50029 |
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