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| Description: A restriction of the identity relation is a one-to-one onto function. |
| Ref | Expression |
|---|---|
| f1oi |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | f1o3 3694 |
. 2
| |
| 2 | df-fo 3196 |
. . 3
| |
| 3 | fnresi 3603 |
. . 3
| |
| 4 | rnresi 3418 |
. . 3
| |
| 5 | 2, 3, 4 | mpbir2an 730 |
. 2
|
| 6 | funi 3545 |
. . . 4
| |
| 7 | cnvi 3447 |
. . . . 5
| |
| 8 | funeq 3535 |
. . . . 5
| |
| 9 | 7, 8 | ax-mp 7 |
. . . 4
|
| 10 | 6, 9 | mpbir 190 |
. . 3
|
| 11 | funres11 3567 |
. . 3
| |
| 12 | 10, 11 | ax-mp 7 |
. 2
|
| 13 | 1, 5, 12 | mpbir2an 730 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: f1ovi 3718 isoid 3895 enrefg 4390 idssen 4406 ssdomg 4408 acdc2lem2 7489 acdc5lem2 7492 hoif 9680 idunop 9902 idcnop 9905 elunop2t 9938 ghomsn 10388 symggrpi 10406 symgidi 10407 idhme 10522 hmphre 10530 idfisf 10760 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 962 ax-gen 963 ax-8 964 ax-9 965 ax-10 966 ax-11 967 ax-12 968 ax-13 969 ax-14 970 ax-17 971 ax-4 973 ax-5o 975 ax-6o 978 ax-9o 1123 ax-10o 1140 ax-16 1210 ax-11o 1218 ax-ext 1459 ax-sep 2703 ax-pow 2742 ax-pr 2779 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 981 df-sb 1172 df-eu 1382 df-mo 1383 df-clab 1464 df-cleq 1469 df-clel 1472 df-ne 1587 df-rex 1650 df-v 1812 df-dif 2049 df-un 2050 df-in 2051 df-ss 2053 df-nul 2281 df-pw 2402 df-sn 2412 df-pr 2413 df-op 2416 df-br 2620 df-opab 2667 df-id 2835 df-xp 3184 df-rel 3185 df-cnv 3186 df-co 3187 df-dm 3188 df-rn 3189 df-res 3190 df-ima 3191 df-fun 3192 df-fn 3193 df-f 3194 df-f1 3195 df-fo 3196 df-f1o 3197 |