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Mirrors > Home > ILE Home > Th. List > fo1st | GIF version |
Description: The 1st function maps the universe onto the universe. (Contributed by NM, 14-Oct-2004.) (Revised by Mario Carneiro, 8-Sep-2013.) |
Ref | Expression |
---|---|
fo1st | ⊢ 1st :V–onto→V |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | vex 2684 | . . . . . 6 ⊢ 𝑥 ∈ V | |
2 | 1 | snex 4104 | . . . . 5 ⊢ {𝑥} ∈ V |
3 | 2 | dmex 4800 | . . . 4 ⊢ dom {𝑥} ∈ V |
4 | 3 | uniex 4354 | . . 3 ⊢ ∪ dom {𝑥} ∈ V |
5 | df-1st 6031 | . . 3 ⊢ 1st = (𝑥 ∈ V ↦ ∪ dom {𝑥}) | |
6 | 4, 5 | fnmpti 5246 | . 2 ⊢ 1st Fn V |
7 | 5 | rnmpt 4782 | . . 3 ⊢ ran 1st = {𝑦 ∣ ∃𝑥 ∈ V 𝑦 = ∪ dom {𝑥}} |
8 | vex 2684 | . . . . 5 ⊢ 𝑦 ∈ V | |
9 | 8, 8 | opex 4146 | . . . . . 6 ⊢ 〈𝑦, 𝑦〉 ∈ V |
10 | 8, 8 | op1sta 5015 | . . . . . . 7 ⊢ ∪ dom {〈𝑦, 𝑦〉} = 𝑦 |
11 | 10 | eqcomi 2141 | . . . . . 6 ⊢ 𝑦 = ∪ dom {〈𝑦, 𝑦〉} |
12 | sneq 3533 | . . . . . . . . . 10 ⊢ (𝑥 = 〈𝑦, 𝑦〉 → {𝑥} = {〈𝑦, 𝑦〉}) | |
13 | 12 | dmeqd 4736 | . . . . . . . . 9 ⊢ (𝑥 = 〈𝑦, 𝑦〉 → dom {𝑥} = dom {〈𝑦, 𝑦〉}) |
14 | 13 | unieqd 3742 | . . . . . . . 8 ⊢ (𝑥 = 〈𝑦, 𝑦〉 → ∪ dom {𝑥} = ∪ dom {〈𝑦, 𝑦〉}) |
15 | 14 | eqeq2d 2149 | . . . . . . 7 ⊢ (𝑥 = 〈𝑦, 𝑦〉 → (𝑦 = ∪ dom {𝑥} ↔ 𝑦 = ∪ dom {〈𝑦, 𝑦〉})) |
16 | 15 | rspcev 2784 | . . . . . 6 ⊢ ((〈𝑦, 𝑦〉 ∈ V ∧ 𝑦 = ∪ dom {〈𝑦, 𝑦〉}) → ∃𝑥 ∈ V 𝑦 = ∪ dom {𝑥}) |
17 | 9, 11, 16 | mp2an 422 | . . . . 5 ⊢ ∃𝑥 ∈ V 𝑦 = ∪ dom {𝑥} |
18 | 8, 17 | 2th 173 | . . . 4 ⊢ (𝑦 ∈ V ↔ ∃𝑥 ∈ V 𝑦 = ∪ dom {𝑥}) |
19 | 18 | abbi2i 2252 | . . 3 ⊢ V = {𝑦 ∣ ∃𝑥 ∈ V 𝑦 = ∪ dom {𝑥}} |
20 | 7, 19 | eqtr4i 2161 | . 2 ⊢ ran 1st = V |
21 | df-fo 5124 | . 2 ⊢ (1st :V–onto→V ↔ (1st Fn V ∧ ran 1st = V)) | |
22 | 6, 20, 21 | mpbir2an 926 | 1 ⊢ 1st :V–onto→V |
Colors of variables: wff set class |
Syntax hints: = wceq 1331 ∈ wcel 1480 {cab 2123 ∃wrex 2415 Vcvv 2681 {csn 3522 〈cop 3525 ∪ cuni 3731 dom cdm 4534 ran crn 4535 Fn wfn 5113 –onto→wfo 5116 1st c1st 6029 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-sep 4041 ax-pow 4093 ax-pr 4126 ax-un 4350 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-eu 2000 df-mo 2001 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ral 2419 df-rex 2420 df-v 2683 df-un 3070 df-in 3072 df-ss 3079 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-br 3925 df-opab 3985 df-mpt 3986 df-id 4210 df-xp 4540 df-rel 4541 df-cnv 4542 df-co 4543 df-dm 4544 df-rn 4545 df-fun 5120 df-fn 5121 df-fo 5124 df-1st 6031 |
This theorem is referenced by: 1stcof 6054 1stexg 6058 df1st2 6109 1stconst 6111 algrflem 6119 algrflemg 6120 suplocexprlemell 7514 suplocexprlem2b 7515 suplocexprlemlub 7525 upxp 12430 uptx 12432 cnmpt1st 12446 |
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