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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 5493 |
. . 3
| |
| 2 | cnveq 4931 |
. . . 4
| |
| 3 | 2 | funeqd 5376 |
. . 3
|
| 4 | 1, 3 | anbi12d 473 |
. 2
|
| 5 | df-f1 5359 |
. 2
| |
| 6 | df-f1 5359 |
. 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 2216 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-v 2817 df-un 3217 df-in 3219 df-ss 3226 df-sn 3697 df-pr 3698 df-op 3700 df-br 4112 df-opab 4174 df-rel 4758 df-cnv 4759 df-co 4760 df-dm 4761 df-rn 4762 df-fun 5356 df-fn 5357 df-f 5358 df-f1 5359 |
| This theorem is referenced by: f1oeq1 5604 f1eq123d 5608 fun11iun 5637 fo00 5654 tposf12 6502 f1dom4g 6994 f1dom2g 6997 f1domg 6999 dom3d 7015 domtr 7027 dom1o 7071 djudom 7386 difinfsn 7393 djudoml 7528 djudomr 7529 4sqlem11 13103 nninfdc 13221 conjsubgen 14012 |
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