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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 5260 | . . . 4 ⊢ ∅ ∈ V | |
| 2 | restval 17602 | . . . 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 6681 | . . . . 5 ⊢ (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴)) = ∅ | |
| 5 | 4 | rneqi 5918 | . . . 4 ⊢ ran (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴)) = ran ∅ |
| 6 | rn0 5907 | . . . 4 ⊢ ran ∅ = ∅ | |
| 7 | 5, 6 | eqtri 2783 | . . 3 ⊢ ran (𝑥 ∈ ∅ ↦ (𝑥 ∩ 𝐴)) = ∅ |
| 8 | 3, 7 | eqtrdi 2811 | . 2 ⊢ (𝐴 ∈ V → (∅ ↾t 𝐴) = ∅) |
| 9 | relxp 5668 | . . . 4 ⊢ Rel (V × V) | |
| 10 | restfn 17600 | . . . . . 6 ⊢ ↾t Fn (V × V) | |
| 11 | 10 | fndmi 6643 | . . . . 5 ⊢ dom ↾t = (V × V) |
| 12 | 11 | releqi 5753 | . . . 4 ⊢ (Rel dom ↾t ↔ Rel (V × V)) |
| 13 | 9, 12 | mpbir 234 | . . 3 ⊢ Rel dom ↾t |
| 14 | 13 | ovprc2 7460 | . 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 1569 ∈ wcel 2144 Vcvv 3450 ∩ cin 4089 ∅c0 4278 ↦ cmpt 5185 × cxp 5648 dom cdm 5650 ran crn 5651 Rel wrel 5655 (class class class)co 7420 ↾t crest 17596 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pr 5390 ax-un 7751 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-id 5545 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-ov 7423 df-oprab 7424 df-mpo 7425 df-1st 8001 df-2nd 8002 df-rest 17598 |
| This theorem is used by: firest 17608 topnval 17610 resstopn 23509 ussval 24583 bj-rest00 38094 |
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