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| Mirrors > Home > MPE Home > Th. List > imadisj | Structured version Visualization version GIF version | ||
| Description: A class whose image under another is empty is disjoint with the other's domain. (Contributed by FL, 24-Jan-2007.) |
| Ref | Expression |
|---|---|
| imadisj | ⊢ ((𝐴 “ 𝐵) = ∅ ↔ (dom 𝐴 ∩ 𝐵) = ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-ima 5636 | . . 3 ⊢ (𝐴 “ 𝐵) = ran (𝐴 ↾ 𝐵) | |
| 2 | 1 | eqeq1i 2734 | . 2 ⊢ ((𝐴 “ 𝐵) = ∅ ↔ ran (𝐴 ↾ 𝐵) = ∅) |
| 3 | dm0rn0 5871 | . 2 ⊢ (dom (𝐴 ↾ 𝐵) = ∅ ↔ ran (𝐴 ↾ 𝐵) = ∅) | |
| 4 | dmres 5967 | . . . 4 ⊢ dom (𝐴 ↾ 𝐵) = (𝐵 ∩ dom 𝐴) | |
| 5 | incom 4162 | . . . 4 ⊢ (𝐵 ∩ dom 𝐴) = (dom 𝐴 ∩ 𝐵) | |
| 6 | 4, 5 | eqtri 2752 | . . 3 ⊢ dom (𝐴 ↾ 𝐵) = (dom 𝐴 ∩ 𝐵) |
| 7 | 6 | eqeq1i 2734 | . 2 ⊢ (dom (𝐴 ↾ 𝐵) = ∅ ↔ (dom 𝐴 ∩ 𝐵) = ∅) |
| 8 | 2, 3, 7 | 3bitr2i 299 | 1 ⊢ ((𝐴 “ 𝐵) = ∅ ↔ (dom 𝐴 ∩ 𝐵) = ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 = wceq 1540 ∩ cin 3904 ∅c0 4286 dom cdm 5623 ran crn 5624 ↾ cres 5625 “ cima 5626 |
| 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 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5238 ax-nul 5248 ax-pr 5374 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-clab 2708 df-cleq 2721 df-clel 2803 df-ral 3045 df-rex 3054 df-rab 3397 df-v 3440 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-nul 4287 df-if 4479 df-sn 4580 df-pr 4582 df-op 4586 df-br 5096 df-opab 5158 df-xp 5629 df-cnv 5631 df-dm 5633 df-rn 5634 df-res 5635 df-ima 5636 |
| This theorem is referenced by: imadisjlnd 6036 ndmima 6058 fnimadisj 6618 fnimaeq0 6619 fimacnvdisj 6706 frxp2 8084 frxp3 8091 acndom2 9967 isf34lem5 10291 isf34lem7 10292 isf34lem6 10293 limsupgre 15406 isercolllem3 15592 pf1rcl 22252 cnconn 23325 1stcfb 23348 xkohaus 23556 qtopeu 23619 fbasrn 23787 mbflimsup 25583 preiman0 32666 eulerpartlemt 34341 erdszelem5 35170 fnwe2lem2 43027 imadisjld 44136 |
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