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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 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | feq1 5050 |
. . 3
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2 | cnveq 4527 |
. . . 4
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3 | 2 | funeqd 4943 |
. . 3
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4 | 1, 3 | anbi12d 456 |
. 2
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5 | df-f1 4927 |
. 2
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6 | df-f1 4927 |
. 2
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7 | 4, 5, 6 | 3bitr4g 221 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 |
This theorem depends on definitions: df-bi 115 df-3an 921 df-tru 1287 df-nf 1390 df-sb 1686 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-v 2603 df-un 2977 df-in 2979 df-ss 2986 df-sn 3404 df-pr 3405 df-op 3407 df-br 3786 df-opab 3840 df-rel 4370 df-cnv 4371 df-co 4372 df-dm 4373 df-rn 4374 df-fun 4924 df-fn 4925 df-f 4926 df-f1 4927 |
This theorem is referenced by: f1oeq1 5137 f1eq123d 5141 fun11iun 5167 fo00 5182 tposf12 5907 f1dom2g 6259 f1domg 6261 dom3d 6277 domtr 6288 |
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