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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 6972). (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 5910 | . 2 ⊢ ( I ↾ 𝐴) ⊆ (𝐴 × 𝐴) | |
2 | sqxpexg 7471 | . 2 ⊢ (𝐴 ∈ 𝑉 → (𝐴 × 𝐴) ∈ V) | |
3 | ssexg 5219 | . 2 ⊢ ((( I ↾ 𝐴) ⊆ (𝐴 × 𝐴) ∧ (𝐴 × 𝐴) ∈ V) → ( I ↾ 𝐴) ∈ V) | |
4 | 1, 2, 3 | sylancr 589 | 1 ⊢ (𝐴 ∈ 𝑉 → ( I ↾ 𝐴) ∈ V) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2110 Vcvv 3494 ⊆ wss 3935 I cid 5453 × cxp 5547 ↾ cres 5551 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5195 ax-nul 5202 ax-pow 5258 ax-pr 5321 ax-un 7455 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4561 df-pr 4563 df-op 4567 df-uni 4832 df-br 5059 df-opab 5121 df-id 5454 df-xp 5555 df-rel 5556 df-res 5561 |
This theorem is referenced by: ordiso 8974 wdomref 9030 dfac9 9556 relexp0g 14375 relexpsucnnr 14378 ndxarg 16502 idfu2nd 17141 idfu1st 17143 idfucl 17145 funcestrcsetclem4 17387 equivestrcsetc 17396 funcsetcestrclem4 17402 sursubmefmnd 18055 injsubmefmnd 18056 smndex1n0mnd 18071 pf1ind 20512 islinds2 20951 ausgrusgrb 26944 upgrres1lem1 27085 cusgrexilem1 27215 sizusglecusg 27239 pliguhgr 28257 bj-evalid 34361 bj-diagval 34460 poimirlem15 34901 xrnidresex 35649 dib0 38294 dicn0 38322 cdlemn11a 38337 dihord6apre 38386 dihatlat 38464 dihpN 38466 eldioph2lem1 39350 eldioph2lem2 39351 dfrtrcl5 39982 dfrcl2 40012 relexpiidm 40042 uspgrsprfo 44017 rngcidALTV 44256 ringcidALTV 44319 |
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