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| Mirrors > Home > ILE Home > Th. List > f1ovi | GIF version | ||
| Description: The identity relation is a one-to-one onto function on the universe. (Contributed by NM, 16-May-2004.) |
| Ref | Expression |
|---|---|
| f1ovi | ⊢ I :V–1-1-onto→V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | f1oi 5626 | . 2 ⊢ ( I ↾ V):V–1-1-onto→V | |
| 2 | reli 4861 | . . . 4 ⊢ Rel I | |
| 3 | dfrel3 5196 | . . . 4 ⊢ (Rel I ↔ ( I ↾ V) = I ) | |
| 4 | 2, 3 | mpbi 145 | . . 3 ⊢ ( I ↾ V) = I |
| 5 | f1oeq1 5574 | . . 3 ⊢ (( I ↾ V) = I → (( I ↾ V):V–1-1-onto→V ↔ I :V–1-1-onto→V)) | |
| 6 | 4, 5 | ax-mp 5 | . 2 ⊢ (( I ↾ V):V–1-1-onto→V ↔ I :V–1-1-onto→V) |
| 7 | 1, 6 | mpbi 145 | 1 ⊢ I :V–1-1-onto→V |
| Colors of variables: wff set class |
| Syntax hints: ↔ wb 105 = wceq 1397 Vcvv 2801 I cid 4387 ↾ cres 4729 Rel wrel 4732 –1-1-onto→wf1o 5327 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-14 2204 ax-ext 2212 ax-sep 4208 ax-pow 4266 ax-pr 4301 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-nf 1509 df-sb 1810 df-eu 2081 df-mo 2082 df-clab 2217 df-cleq 2223 df-clel 2226 df-nfc 2362 df-ral 2514 df-rex 2515 df-v 2803 df-un 3203 df-in 3205 df-ss 3212 df-pw 3655 df-sn 3676 df-pr 3677 df-op 3679 df-br 4090 df-opab 4152 df-id 4392 df-xp 4733 df-rel 4734 df-cnv 4735 df-co 4736 df-dm 4737 df-rn 4738 df-res 4739 df-ima 4740 df-fun 5330 df-fn 5331 df-f 5332 df-f1 5333 df-fo 5334 df-f1o 5335 |
| This theorem is referenced by: residfi 7144 |
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