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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 6859 | . 2 ⊢ ( I ↾ V):V–1-1-onto→V | |
| 2 | reli 5812 | . . . 4 ⊢ Rel I | |
| 3 | dfrel3 6196 | . . . 4 ⊢ (Rel I ↔ ( I ↾ V) = I ) | |
| 4 | 2, 3 | mpbi 233 | . . 3 ⊢ ( I ↾ V) = I |
| 5 | f1oeq1 6808 | . . 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 1569 Vcvv 3454 I cid 5554 ↾ cres 5662 Rel wrel 5665 –1-1-onto→wf1o 6535 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1824 ax-4 1838 ax-5 1939 ax-6 1996 ax-7 2037 ax-8 2144 ax-9 2152 ax-ext 2734 ax-sep 5256 ax-pr 5403 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1104 df-tru 1572 df-fal 1582 df-ex 1809 df-sb 2096 df-clab 2741 df-cleq 2754 df-clel 2837 df-ral 3079 df-rex 3089 df-rab 3416 df-v 3456 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-nul 4286 df-if 4487 df-sn 4589 df-pr 4591 df-op 4595 df-br 5109 df-opab 5173 df-id 5555 df-xp 5666 df-rel 5667 df-cnv 5668 df-co 5669 df-dm 5670 df-rn 5671 df-res 5672 df-ima 5673 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 |
| This theorem is used by: ncanth 7367 nregmodelf1o 45752 |
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