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| Mirrors > Home > MPE Home > Th. List > 0rest | Structured version Visualization version GIF version | ||
| Description: Value of the structure restriction when the topology input is empty. (Contributed by Mario Carneiro, 13-Aug-2015.) |
| Ref | Expression |
|---|---|
| 0rest | ⊢ (∅ ↾t 𝐴) = ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0ex 5268 | . . . 4 ⊢ ∅ ∈ V | |
| 2 | restval 17517 | . . . 4 ⊢ ((∅ ∈ V ∧ 𝐴 ∈ V) → (∅ ↾t 𝐴) = ran (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴))) | |
| 3 | 1, 2 | mpan 703 | . . 3 ⊢ (𝐴 ∈ V → (∅ ↾t 𝐴) = ran (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴))) |
| 4 | mpt0 6678 | . . . . 5 ⊢ (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴)) = ∅ | |
| 5 | 4 | rneqi 5925 | . . . 4 ⊢ ran (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴)) = ran ∅ |
| 6 | rn0 5914 | . . . 4 ⊢ ran ∅ = ∅ | |
| 7 | 5, 6 | eqtri 2785 | . . 3 ⊢ ran (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴)) = ∅ |
| 8 | 3, 7 | eqtrdi 2813 | . 2 ⊢ (𝐴 ∈ V → (∅ ↾t 𝐴) = ∅) |
| 9 | relxp 5677 | . . . 4 ⊢ Rel (V × V) | |
| 10 | restfn 17515 | . . . . . 6 ⊢ ↾t Fn (V × V) | |
| 11 | 10 | fndmi 6640 | . . . . 5 ⊢ dom ↾t = (V × V) |
| 12 | 11 | releqi 5762 | . . . 4 ⊢ (Rel dom ↾t ↔ Rel (V × V)) |
| 13 | 9, 12 | mpbir 234 | . . 3 ⊢ Rel dom ↾t |
| 14 | 13 | ovprc2 7457 | . 2 ⊢ (¬ 𝐴 ∈ V → (∅ ↾t 𝐴) = ∅) |
| 15 | 8, 14 | pm2.61i 184 | 1 ⊢ (∅ ↾t 𝐴) = ∅ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1570 ∈ wcel 2145 Vcvv 3453 ∩ cin 3901 ∅c0 4282 ↦ cmpt 5190 × cxp 5657 dom cdm 5659 ran crn 5660 Rel wrel 5664 (class class class)co 7417 ↾t crest 17511 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-rep 5236 ax-sep 5255 ax-nul 5267 ax-pr 5402 ax-un 7740 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-ral 3079 df-rex 3089 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4283 df-if 4486 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-id 5554 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-ov 7420 df-oprab 7421 df-mpo 7422 df-1st 7990 df-2nd 7991 df-rest 17513 |
| This theorem is used by: firest 17523 topnval 17525 resstopn 23417 ussval 24491 bj-rest00 37839 |
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