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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 7161). (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 6007 | . 2 ⊢ ( I ↾ 𝐴) ⊆ (𝐴 × 𝐴) | |
| 2 | sqxpexg 7700 | . 2 ⊢ (𝐴 ∈ 𝑉 → (𝐴 × 𝐴) ∈ V) | |
| 3 | ssexg 5267 | . 2 ⊢ ((( I ↾ 𝐴) ⊆ (𝐴 × 𝐴) ∧ (𝐴 × 𝐴) ∈ V) → ( I ↾ 𝐴) ∈ V) | |
| 4 | 1, 2, 3 | sylancr 588 | 1 ⊢ (𝐴 ∈ 𝑉 → ( I ↾ 𝐴) ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2114 Vcvv 3439 ⊆ wss 3900 I cid 5517 × cxp 5621 ↾ cres 5625 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2707 ax-sep 5240 ax-nul 5250 ax-pow 5309 ax-pr 5376 ax-un 7680 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2714 df-cleq 2727 df-clel 2810 df-ral 3051 df-rex 3060 df-rab 3399 df-v 3441 df-dif 3903 df-un 3905 df-in 3907 df-ss 3917 df-nul 4285 df-if 4479 df-pw 4555 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4863 df-br 5098 df-opab 5160 df-id 5518 df-xp 5629 df-rel 5630 df-res 5635 |
| This theorem is referenced by: ordiso 9423 wdomref 9479 dfac9 10049 relexp0g 14947 relexpsucnnr 14950 ndxarg 17125 idfu2nd 17803 idfu1st 17805 idfucl 17807 funcestrcsetclem4 18068 equivestrcsetc 18077 funcsetcestrclem4 18083 sursubmefmnd 18823 injsubmefmnd 18824 smndex1n0mnd 18839 islinds2 21770 pf1ind 22301 ausgrusgrb 29219 upgrres1lem1 29363 cusgrexilem1 29493 sizusglecusg 29518 pliguhgr 30542 bj-evalid 37250 bj-diagval 37348 poimirlem15 37805 xrnidresex 38600 dib0 41459 dicn0 41487 cdlemn11a 41502 dihord6apre 41551 dihatlat 41629 dihpN 41631 eldioph2lem1 43039 eldioph2lem2 43040 dfrtrcl5 43907 dfrcl2 43952 relexpiidm 43982 ushggricedg 48210 uspgrsprfo 48431 rngcidALTV 48557 ringcidALTV 48591 resipos 49257 cofidvala 49398 cofidval 49401 opf2fval 49687 fucoppc 49692 idfudiag1bas 49806 idfudiag1 49807 |
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