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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 5496 |
. . 3
| |
| 2 | cnveq 4934 |
. . . 4
| |
| 3 | 2 | funeqd 5379 |
. . 3
|
| 4 | 1, 3 | anbi12d 473 |
. 2
|
| 5 | df-f1 5362 |
. 2
| |
| 6 | df-f1 5362 |
. 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 3218 df-in 3220 df-ss 3227 df-sn 3700 df-pr 3701 df-op 3703 df-br 4115 df-opab 4177 df-rel 4761 df-cnv 4762 df-co 4763 df-dm 4764 df-rn 4765 df-fun 5359 df-fn 5360 df-f 5361 df-f1 5362 |
| This theorem is referenced by: f1oeq1 5607 f1eq123d 5611 fun11iun 5640 fo00 5657 tposf12 6513 f1dom4g 7005 f1dom2g 7008 f1domg 7010 dom3d 7026 domtr 7038 dom1o 7082 djudom 7397 difinfsn 7404 djudoml 7539 djudomr 7540 4sqlem11 13124 nninfdc 13288 conjsubgen 14031 |
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