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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 7201). (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 6040 | . 2 ⊢ ( I ↾ 𝐴) ⊆ (𝐴 × 𝐴) | |
| 2 | sqxpexg 7740 | . 2 ⊢ (𝐴 ∈ 𝑉 → (𝐴 × 𝐴) ∈ V) | |
| 3 | ssexg 5281 | . 2 ⊢ ((( I ↾ 𝐴) ⊆ (𝐴 × 𝐴) ∧ (𝐴 × 𝐴) ∈ V) → ( I ↾ 𝐴) ∈ V) | |
| 4 | 1, 2, 3 | sylancr 596 | 1 ⊢ (𝐴 ∈ 𝑉 → ( I ↾ 𝐴) ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2144 Vcvv 3456 ⊆ wss 3906 I cid 5543 × cxp 5647 ↾ cres 5651 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1817 ax-4 1831 ax-5 1932 ax-6 1989 ax-7 2030 ax-8 2146 ax-9 2154 ax-ext 2736 ax-sep 5248 ax-pow 5324 ax-pr 5392 ax-un 7720 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3an 1101 df-tru 1565 df-fal 1575 df-ex 1802 df-sb 2093 df-clab 2743 df-cleq 2756 df-clel 2839 df-ral 3079 df-rex 3089 df-rab 3417 df-v 3458 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4288 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5103 df-opab 5165 df-id 5544 df-xp 5655 df-rel 5656 df-res 5661 |
| This theorem is referenced by: ordiso 9466 wdomref 9522 dfac9 10095 relexp0g 15037 relexpsucnnr 15040 ndxarg 17234 idfu2nd 17912 idfu1st 17914 idfucl 17916 funcestrcsetclem4 18177 equivestrcsetc 18186 funcsetcestrclem4 18192 sursubmefmnd 18932 injsubmefmnd 18933 smndex1n0mnd 18951 islinds2 21867 pf1ind 22420 ausgrusgrb 29368 upgrres1lem1 29512 cusgrexilem1 29642 sizusglecusg 29666 pliguhgr 30691 bj-evalid 37571 bj-diagval 37671 poimirlem15 38139 xrnidresex 38934 dib0 41793 dicn0 41821 cdlemn11a 41836 dihord6apre 41885 dihatlat 41963 dihpN 41965 eldioph2lem1 43346 eldioph2lem2 43347 dfrtrcl5 44210 dfrcl2 44255 relexpiidm 44285 ushggricedg 48554 uspgrsprfo 48775 rngcidALTV 48901 ringcidALTV 48935 resipos 49601 cofidvala 49742 cofidval 49745 opf2fval 50031 fucoppc 50036 idfudiag1bas 50150 idfudiag1 50151 |
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