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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 3685 |
. 2
| |
| 2 | df-fo 3191 |
. . 3
| |
| 3 | fnresi 3595 |
. . 3
| |
| 4 | rnresi 3410 |
. . 3
| |
| 5 | 2, 3, 4 | mpbir2an 729 |
. 2
|
| 6 | funi 3537 |
. . . 4
| |
| 7 | cnvi 3439 |
. . . . 5
| |
| 8 | funeq 3527 |
. . . . 5
| |
| 9 | 7, 8 | ax-mp 7 |
. . . 4
|
| 10 | 6, 9 | mpbir 190 |
. . 3
|
| 11 | funres11 3559 |
. . 3
| |
| 12 | 10, 11 | ax-mp 7 |
. 2
|
| 13 | 1, 5, 12 | mpbir2an 729 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: f1ovi 3709 isoid 3886 enrefg 4377 idssen 4393 ssdomg 4395 acdc2lem2 7439 acdc5lem2 7442 hoif 9620 idunop 9841 idcnop 9844 elunop2t 9876 ghomsn 10322 symggrpi 10340 symgidi 10341 idhme 10445 hmphre 10453 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 960 ax-gen 961 ax-8 962 ax-9 963 ax-10 964 ax-11 965 ax-12 966 ax-13 967 ax-14 968 ax-17 969 ax-4 971 ax-5o 973 ax-6o 976 ax-9o 1121 ax-10o 1138 ax-16 1208 ax-11o 1216 ax-ext 1457 ax-sep 2698 ax-pow 2737 ax-pr 2774 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 979 df-sb 1170 df-eu 1380 df-mo 1381 df-clab 1462 df-cleq 1467 df-clel 1470 df-ne 1584 df-rex 1647 df-v 1808 df-dif 2045 df-un 2046 df-in 2047 df-ss 2049 df-nul 2277 df-pw 2398 df-sn 2408 df-pr 2409 df-op 2412 df-br 2615 df-opab 2662 df-id 2830 df-xp 3179 df-rel 3180 df-cnv 3181 df-co 3182 df-dm 3183 df-rn 3184 df-res 3185 df-ima 3186 df-fun 3187 df-fn 3188 df-f 3189 df-f1 3190 df-fo 3191 df-f1o 3192 |