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| Mirrors > Home > MPE Home > Th. List > ressabs | Structured version Visualization version GIF version | ||
| Description: Restriction absorption law. (Contributed by Mario Carneiro, 12-Jun-2015.) |
| Ref | Expression |
|---|---|
| ressabs | ⊢ ((𝐴 ∈ 𝑋 ∧ 𝐵 ⊆ 𝐴) → ((𝑊 ↾s 𝐴) ↾s 𝐵) = (𝑊 ↾s 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssexg 5323 | . . . 4 ⊢ ((𝐵 ⊆ 𝐴 ∧ 𝐴 ∈ 𝑋) → 𝐵 ∈ V) | |
| 2 | 1 | ancoms 458 | . . 3 ⊢ ((𝐴 ∈ 𝑋 ∧ 𝐵 ⊆ 𝐴) → 𝐵 ∈ V) |
| 3 | ressress 17293 | . . 3 ⊢ ((𝐴 ∈ 𝑋 ∧ 𝐵 ∈ V) → ((𝑊 ↾s 𝐴) ↾s 𝐵) = (𝑊 ↾s (𝐴 ∩ 𝐵))) | |
| 4 | 2, 3 | syldan 591 | . 2 ⊢ ((𝐴 ∈ 𝑋 ∧ 𝐵 ⊆ 𝐴) → ((𝑊 ↾s 𝐴) ↾s 𝐵) = (𝑊 ↾s (𝐴 ∩ 𝐵))) |
| 5 | simpr 484 | . . . 4 ⊢ ((𝐴 ∈ 𝑋 ∧ 𝐵 ⊆ 𝐴) → 𝐵 ⊆ 𝐴) | |
| 6 | sseqin2 4223 | . . . 4 ⊢ (𝐵 ⊆ 𝐴 ↔ (𝐴 ∩ 𝐵) = 𝐵) | |
| 7 | 5, 6 | sylib 218 | . . 3 ⊢ ((𝐴 ∈ 𝑋 ∧ 𝐵 ⊆ 𝐴) → (𝐴 ∩ 𝐵) = 𝐵) |
| 8 | 7 | oveq2d 7447 | . 2 ⊢ ((𝐴 ∈ 𝑋 ∧ 𝐵 ⊆ 𝐴) → (𝑊 ↾s (𝐴 ∩ 𝐵)) = (𝑊 ↾s 𝐵)) |
| 9 | 4, 8 | eqtrd 2777 | 1 ⊢ ((𝐴 ∈ 𝑋 ∧ 𝐵 ⊆ 𝐴) → ((𝑊 ↾s 𝐴) ↾s 𝐵) = (𝑊 ↾s 𝐵)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1540 ∈ wcel 2108 Vcvv 3480 ∩ cin 3950 ⊆ wss 3951 (class class class)co 7431 ↾s cress 17274 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-sep 5296 ax-nul 5306 ax-pow 5365 ax-pr 5432 ax-un 7755 ax-cnex 11211 ax-1cn 11213 ax-addcl 11215 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-ral 3062 df-rex 3071 df-reu 3381 df-rab 3437 df-v 3482 df-sbc 3789 df-csb 3900 df-dif 3954 df-un 3956 df-in 3958 df-ss 3968 df-pss 3971 df-nul 4334 df-if 4526 df-pw 4602 df-sn 4627 df-pr 4629 df-op 4633 df-uni 4908 df-iun 4993 df-br 5144 df-opab 5206 df-mpt 5226 df-tr 5260 df-id 5578 df-eprel 5584 df-po 5592 df-so 5593 df-fr 5637 df-we 5639 df-xp 5691 df-rel 5692 df-cnv 5693 df-co 5694 df-dm 5695 df-rn 5696 df-res 5697 df-ima 5698 df-pred 6321 df-ord 6387 df-on 6388 df-lim 6389 df-suc 6390 df-iota 6514 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-ov 7434 df-oprab 7435 df-mpo 7436 df-om 7888 df-2nd 8015 df-frecs 8306 df-wrecs 8337 df-recs 8411 df-rdg 8450 df-nn 12267 df-sets 17201 df-slot 17219 df-ndx 17231 df-base 17248 df-ress 17275 |
| This theorem is referenced by: rescabs 17877 rescabsOLD 17878 rescabs2 17879 subsubmgm 18723 subsubm 18829 subsubg 19167 subgslw 19634 pgpfaclem1 20101 ablfaclem3 20107 subsubrng 20563 subsubrg 20598 subdrgint 20804 lsslss 20959 xrge0cmn 21426 zringunit 21477 cnmsgngrp 21597 psgninv 21600 zrhpsgnmhm 21602 xrge0gsumle 24855 xrge0tsms 24856 reefgim 26494 xrge0tsmsd 33065 nn0omnd 33373 nn0archi 33375 resssra 33638 fedgmullem1 33680 fedgmullem2 33681 fedgmul 33682 fldsdrgfldext2 33713 fldextrspunlem1 33725 fldextrspunfld 33726 fldextrspundgdvdslem 33730 fldextrspundgdvds 33731 algextdeglem1 33758 algextdeglem4 33761 rrhcn 33998 qqtopn 34012 lnmlsslnm 43093 lmhmlnmsplit 43099 gsumge0cl 46386 sge0tsms 46395 amgmlemALT 49322 |
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