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| Mirrors > Home > ILE Home > Th. List > f1oi | GIF version | ||
| Description: A restriction of the identity relation is a one-to-one onto function. (Contributed by NM, 30-Apr-1998.) (Proof shortened by Andrew Salmon, 22-Oct-2011.) |
| Ref | Expression |
|---|---|
| f1oi | ⊢ ( I ↾ 𝐴):𝐴–1-1-onto→𝐴 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fnresi 5447 | . 2 ⊢ ( I ↾ 𝐴) Fn 𝐴 | |
| 2 | cnvresid 5401 | . . . 4 ⊢ ◡( I ↾ 𝐴) = ( I ↾ 𝐴) | |
| 3 | 2 | fneq1i 5421 | . . 3 ⊢ (◡( I ↾ 𝐴) Fn 𝐴 ↔ ( I ↾ 𝐴) Fn 𝐴) |
| 4 | 1, 3 | mpbir 146 | . 2 ⊢ ◡( I ↾ 𝐴) Fn 𝐴 |
| 5 | dff1o4 5588 | . 2 ⊢ (( I ↾ 𝐴):𝐴–1-1-onto→𝐴 ↔ (( I ↾ 𝐴) Fn 𝐴 ∧ ◡( I ↾ 𝐴) Fn 𝐴)) | |
| 6 | 1, 4, 5 | mpbir2an 948 | 1 ⊢ ( I ↾ 𝐴):𝐴–1-1-onto→𝐴 |
| Colors of variables: wff set class |
| Syntax hints: I cid 4383 ◡ccnv 4722 ↾ cres 4725 Fn wfn 5319 –1-1-onto→wf1o 5323 |
| 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 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-14 2203 ax-ext 2211 ax-sep 4205 ax-pow 4262 ax-pr 4297 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-rex 2514 df-v 2802 df-un 3202 df-in 3204 df-ss 3211 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-br 4087 df-opab 4149 df-id 4388 df-xp 4729 df-rel 4730 df-cnv 4731 df-co 4732 df-dm 4733 df-rn 4734 df-res 4735 df-ima 4736 df-fun 5326 df-fn 5327 df-f 5328 df-f1 5329 df-fo 5330 df-f1o 5331 |
| This theorem is referenced by: f1ovi 5620 isoid 5946 enrefg 6932 ssdomg 6947 omp1eomlem 7284 ctm 7299 omct 7307 ctssexmid 7340 ssomct 13056 idmhm 13542 idghm 13836 ssidcn 14924 dvid 15409 dvidre 15411 dvexp 15425 ausgrusgrben 16007 subctctexmid 16537 |
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