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| Description: The domain and range of a one-to-one, onto function are equinumerous. |
| Ref | Expression |
|---|---|
| f1oeng |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fnex 3603 |
. . . 4
| |
| 2 | 1 | ancoms 436 |
. . 3
|
| 3 | f1ofn 3685 |
. . 3
| |
| 4 | 2, 3 | sylan2 451 |
. 2
|
| 5 | f1oen2g 4384 |
. 2
| |
| 6 | 4, 5 | sylancom 475 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: f1oen 4388 en2d 4390 unbenlem 7464 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 961 ax-gen 962 ax-8 963 ax-9 964 ax-10 965 ax-11 966 ax-12 967 ax-13 968 ax-14 969 ax-17 970 ax-4 972 ax-5o 974 ax-6o 977 ax-9o 1122 ax-10o 1139 ax-16 1209 ax-11o 1217 ax-ext 1458 ax-rep 2689 ax-sep 2699 ax-pow 2738 ax-pr 2775 ax-un 2862 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 980 df-sb 1171 df-eu 1381 df-mo 1382 df-clab 1463 df-cleq 1468 df-clel 1471 df-ne 1585 df-rex 1648 df-v 1809 df-dif 2046 df-un 2047 df-in 2048 df-ss 2050 df-nul 2278 df-pw 2399 df-sn 2409 df-pr 2410 df-op 2413 df-uni 2500 df-br 2616 df-opab 2663 df-id 2831 df-xp 3180 df-rel 3181 df-cnv 3182 df-co 3183 df-dm 3184 df-rn 3185 df-res 3186 df-ima 3187 df-fun 3188 df-fn 3189 df-f 3190 df-f1 3191 df-fo 3192 df-f1o 3193 df-en 4360 |