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| Mirrors > Home > MPE Home > Th. List > trfilss | Structured version Visualization version GIF version | ||
| Description: If 𝐴 is a member of the filter, then the filter truncated to 𝐴 is a subset of the original filter. (Contributed by Mario Carneiro, 15-Oct-2015.) |
| Ref | Expression |
|---|---|
| trfilss | ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ 𝐴 ∈ 𝐹) → (𝐹 ↾t 𝐴) ⊆ 𝐹) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | restval 17344 | . 2 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ 𝐴 ∈ 𝐹) → (𝐹 ↾t 𝐴) = ran (𝑥 ∈ 𝐹 ↦ (𝑥 ∩ 𝐴))) | |
| 2 | filin 23796 | . . . . . 6 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑥 ∈ 𝐹 ∧ 𝐴 ∈ 𝐹) → (𝑥 ∩ 𝐴) ∈ 𝐹) | |
| 3 | 2 | 3expa 1118 | . . . . 5 ⊢ (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑥 ∈ 𝐹) ∧ 𝐴 ∈ 𝐹) → (𝑥 ∩ 𝐴) ∈ 𝐹) |
| 4 | 3 | an32s 652 | . . . 4 ⊢ (((𝐹 ∈ (Fil‘𝑋) ∧ 𝐴 ∈ 𝐹) ∧ 𝑥 ∈ 𝐹) → (𝑥 ∩ 𝐴) ∈ 𝐹) |
| 5 | 4 | fmpttd 7058 | . . 3 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ 𝐴 ∈ 𝐹) → (𝑥 ∈ 𝐹 ↦ (𝑥 ∩ 𝐴)):𝐹⟶𝐹) |
| 6 | 5 | frnd 6668 | . 2 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ 𝐴 ∈ 𝐹) → ran (𝑥 ∈ 𝐹 ↦ (𝑥 ∩ 𝐴)) ⊆ 𝐹) |
| 7 | 1, 6 | eqsstrd 3966 | 1 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ 𝐴 ∈ 𝐹) → (𝐹 ↾t 𝐴) ⊆ 𝐹) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2113 ∩ cin 3898 ⊆ wss 3899 ↦ cmpt 5177 ran crn 5623 ‘cfv 6490 (class class class)co 7356 ↾t crest 17338 Filcfil 23787 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2182 ax-ext 2706 ax-rep 5222 ax-sep 5239 ax-nul 5249 ax-pow 5308 ax-pr 5375 ax-un 7678 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2537 df-eu 2567 df-clab 2713 df-cleq 2726 df-clel 2809 df-nfc 2883 df-ne 2931 df-nel 3035 df-ral 3050 df-rex 3059 df-reu 3349 df-rab 3398 df-v 3440 df-sbc 3739 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4579 df-pr 4581 df-op 4585 df-uni 4862 df-iun 4946 df-br 5097 df-opab 5159 df-mpt 5178 df-id 5517 df-xp 5628 df-rel 5629 df-cnv 5630 df-co 5631 df-dm 5632 df-rn 5633 df-res 5634 df-ima 5635 df-iota 6446 df-fun 6492 df-fn 6493 df-f 6494 df-f1 6495 df-fo 6496 df-f1o 6497 df-fv 6498 df-ov 7359 df-oprab 7360 df-mpo 7361 df-rest 17340 df-fbas 21304 df-fil 23788 |
| This theorem is referenced by: fgtr 23832 flimrest 23925 |
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