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| Mirrors > Home > ILE Home > Th. List > f1eq1 | Unicode version | ||
| Description: Equality theorem for one-to-one functions. (Contributed by NM, 10-Feb-1997.) |
| Ref | Expression |
|---|---|
| f1eq1 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | feq1 5491 |
. . 3
| |
| 2 | cnveq 4929 |
. . . 4
| |
| 3 | 2 | funeqd 5374 |
. . 3
|
| 4 | 1, 3 | anbi12d 473 |
. 2
|
| 5 | df-f1 5357 |
. 2
| |
| 6 | df-f1 5357 |
. 2
| |
| 7 | 4, 5, 6 | 3bitr4g 223 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| 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-ext 2214 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-v 2815 df-un 3215 df-in 3217 df-ss 3224 df-sn 3695 df-pr 3696 df-op 3698 df-br 4110 df-opab 4172 df-rel 4756 df-cnv 4757 df-co 4758 df-dm 4759 df-rn 4760 df-fun 5354 df-fn 5355 df-f 5356 df-f1 5357 |
| This theorem is referenced by: f1oeq1 5602 f1eq123d 5606 fun11iun 5635 fo00 5652 tposf12 6500 f1dom4g 6992 f1dom2g 6995 f1domg 6997 dom3d 7013 domtr 7025 dom1o 7069 djudom 7384 difinfsn 7391 djudoml 7526 djudomr 7527 4sqlem11 13099 nninfdc 13204 conjsubgen 13995 |
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