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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 6009 | . 2 ⊢ ( I ↾ 𝐴) ⊆ (𝐴 × 𝐴) | |
| 2 | sqxpexg 7702 | . 2 ⊢ (𝐴 ∈ 𝑉 → (𝐴 × 𝐴) ∈ V) | |
| 3 | ssexg 5269 | . 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 3441 ⊆ wss 3902 I cid 5519 × cxp 5623 ↾ cres 5627 |
| 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 2709 ax-sep 5242 ax-nul 5252 ax-pow 5311 ax-pr 5378 ax-un 7682 |
| 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 2716 df-cleq 2729 df-clel 2812 df-ral 3053 df-rex 3062 df-rab 3401 df-v 3443 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4287 df-if 4481 df-pw 4557 df-sn 4582 df-pr 4584 df-op 4588 df-uni 4865 df-br 5100 df-opab 5162 df-id 5520 df-xp 5631 df-rel 5632 df-res 5637 |
| This theorem is referenced by: ordiso 9425 wdomref 9481 dfac9 10051 relexp0g 14949 relexpsucnnr 14952 ndxarg 17127 idfu2nd 17805 idfu1st 17807 idfucl 17809 funcestrcsetclem4 18070 equivestrcsetc 18079 funcsetcestrclem4 18085 sursubmefmnd 18825 injsubmefmnd 18826 smndex1n0mnd 18841 islinds2 21772 pf1ind 22303 ausgrusgrb 29242 upgrres1lem1 29386 cusgrexilem1 29516 sizusglecusg 29541 pliguhgr 30565 bj-evalid 37283 bj-diagval 37381 poimirlem15 37838 xrnidresex 38633 dib0 41492 dicn0 41520 cdlemn11a 41535 dihord6apre 41584 dihatlat 41662 dihpN 41664 eldioph2lem1 43069 eldioph2lem2 43070 dfrtrcl5 43937 dfrcl2 43982 relexpiidm 44012 ushggricedg 48240 uspgrsprfo 48461 rngcidALTV 48587 ringcidALTV 48621 resipos 49287 cofidvala 49428 cofidval 49431 opf2fval 49717 fucoppc 49722 idfudiag1bas 49836 idfudiag1 49837 |
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