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| Mirrors > Home > MPE Home > Th. List > f1ovi | Structured version Visualization version 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 6860 | . 2 ⊢ ( I ↾ V):V–1-1-onto→V | |
| 2 | reli 5811 | . . . 4 ⊢ Rel I | |
| 3 | dfrel3 6196 | . . . 4 ⊢ (Rel I ↔ ( I ↾ V) = I ) | |
| 4 | 2, 3 | mpbi 233 | . . 3 ⊢ ( I ↾ V) = I |
| 5 | f1oeq1 6809 | . . 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 233 | 1 ⊢ I :V–1-1-onto→V |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 = wceq 1570 Vcvv 3453 I cid 5553 ↾ cres 5661 Rel wrel 5664 –1-1-onto→wf1o 6536 |
| 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-ext 2734 ax-sep 5255 ax-pr 5402 |
| 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-sb 2100 df-clab 2741 df-cleq 2754 df-clel 2837 df-ral 3079 df-rex 3089 df-rab 3415 df-v 3455 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-br 5108 df-opab 5172 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-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 |
| This theorem is used by: ncanth 7371 nregmodelf1o 45840 |
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