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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 5476 | . 2 ⊢ ( I ↾ 𝐴) Fn 𝐴 | |
| 2 | cnvresid 5430 | . . . 4 ⊢ ◡( I ↾ 𝐴) = ( I ↾ 𝐴) | |
| 3 | 2 | fneq1i 5450 | . . 3 ⊢ (◡( I ↾ 𝐴) Fn 𝐴 ↔ ( I ↾ 𝐴) Fn 𝐴) |
| 4 | 1, 3 | mpbir 146 | . 2 ⊢ ◡( I ↾ 𝐴) Fn 𝐴 |
| 5 | dff1o4 5622 | . 2 ⊢ (( I ↾ 𝐴):𝐴–1-1-onto→𝐴 ↔ (( I ↾ 𝐴) Fn 𝐴 ∧ ◡( I ↾ 𝐴) Fn 𝐴)) | |
| 6 | 1, 4, 5 | mpbir2an 951 | 1 ⊢ ( I ↾ 𝐴):𝐴–1-1-onto→𝐴 |
| Colors of variables: wff set class |
| Syntax hints: I cid 4409 ◡ccnv 4748 ↾ cres 4751 Fn wfn 5347 –1-1-onto→wf1o 5351 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-14 2206 ax-ext 2214 ax-sep 4228 ax-pow 4287 ax-pr 4322 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-eu 2083 df-mo 2084 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ral 2525 df-rex 2526 df-v 2815 df-un 3215 df-in 3217 df-ss 3224 df-pw 3671 df-sn 3695 df-pr 3696 df-op 3698 df-br 4110 df-opab 4172 df-id 4414 df-xp 4755 df-rel 4756 df-cnv 4757 df-co 4758 df-dm 4759 df-rn 4760 df-res 4761 df-ima 4762 df-fun 5354 df-fn 5355 df-f 5356 df-f1 5357 df-fo 5358 df-f1o 5359 |
| This theorem is referenced by: f1ovi 5655 isoid 5983 enrefg 7003 ssdomg 7018 omp1eomlem 7385 ctm 7400 omct 7408 ctssexmid 7441 ssomct 13196 idmhm 13682 idghm 13976 ssidcn 15075 dvid 15560 dvidre 15562 dvexp 15576 ausgrusgrben 16163 subctctexmid 16774 gsumgfsum1 16863 |
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