| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 5519 |
. . 3
| |
| 2 | cnveq 4956 |
. . . 4
| |
| 3 | 2 | funeqd 5402 |
. . 3
|
| 4 | 1, 3 | anbi12d 477 |
. 2
|
| 5 | df-f1 5385 |
. 2
| |
| 6 | df-f1 5385 |
. 2
| |
| 7 | 4, 5, 6 | 3bitr4g 223 |
1
|
| Colors of variables: wff set class |
| This proof depends on syntax axioms:
|
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-sn 3715 df-pr 3716 df-op 3718 df-br 4132 df-opab 4194 df-rel 4783 df-cnv 4784 df-co 4785 df-dm 4786 df-rn 4787 df-fun 5382 df-fn 5383 df-f 5384 df-f1 5385 |
| This theorem is used by: f1oeq1 5630 f1eq123d 5634 fun11iun 5663 fo00 5680 tposf12 6544 f1dom4g 7043 f1dom2g 7046 f1domg 7048 dom3d 7064 domtr 7076 dom1o 7120 f1setfi 7322 djudom 7439 difinfsn 7446 djudoml 7581 djudomr 7582 hashf1lem1 11307 hashf1lem2 11308 hashf1 11309 4sqlem11 13209 nninfdc 13402 conjsubgen 14140 |
| Copyright terms: Public domain | W3C validator |