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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 3679 |
. 2
| |
| 2 | df-fo 3186 |
. . 3
| |
| 3 | fnresi 3589 |
. . 3
| |
| 4 | rnresi 3402 |
. . 3
| |
| 5 | 2, 3, 4 | mpbir2an 728 |
. 2
|
| 6 | funi 3531 |
. . . 4
| |
| 7 | cnvi 3433 |
. . . . 5
| |
| 8 | funeq 3521 |
. . . . 5
| |
| 9 | 7, 8 | ax-mp 7 |
. . . 4
|
| 10 | 6, 9 | mpbir 190 |
. . 3
|
| 11 | funres11 3553 |
. . 3
| |
| 12 | 10, 11 | ax-mp 7 |
. 2
|
| 13 | 1, 5, 12 | mpbir2an 728 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: f1ovi 3703 isoid 3880 enrefg 4371 idssen 4387 ssdomg 4389 acdc2lem2 7431 acdc5lem2 7434 hoif 9597 idunop 9818 idcnop 9821 elunop2t 9853 ghomsn 10293 symggrpiOLD 10311 symgidiOLD 10312 symggrpi 10313 symgidi 10314 idhme 10409 hmphre 10417 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 959 ax-gen 960 ax-8 961 ax-9 962 ax-10 963 ax-11 964 ax-12 965 ax-13 966 ax-14 967 ax-17 968 ax-4 970 ax-5o 972 ax-6o 975 ax-9o 1119 ax-10o 1136 ax-16 1206 ax-11o 1213 ax-ext 1452 ax-sep 2693 ax-pow 2732 ax-pr 2769 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 978 df-sb 1168 df-eu 1375 df-mo 1376 df-clab 1457 df-cleq 1462 df-clel 1465 df-ne 1579 df-rex 1642 df-v 1803 df-dif 2039 df-un 2040 df-in 2041 df-ss 2043 df-nul 2271 df-pw 2392 df-sn 2402 df-pr 2403 df-op 2406 df-br 2610 df-opab 2657 df-id 2824 df-xp 3174 df-rel 3175 df-cnv 3176 df-co 3177 df-dm 3178 df-rn 3179 df-res 3180 df-ima 3181 df-fun 3182 df-fn 3183 df-f 3184 df-f1 3185 df-fo 3186 df-f1o 3187 |