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| Mirrors > Home > ILE Home > Th. List > feq1 | Unicode version | ||
| Description: Equality theorem for functions. (Contributed by NM, 1-Aug-1994.) |
| Ref | Expression |
|---|---|
| feq1 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fneq1 5472 |
. . 3
| |
| 2 | rneq 5011 |
. . . 4
| |
| 3 | 2 | sseq1d 3277 |
. . 3
|
| 4 | 1, 3 | anbi12d 477 |
. 2
|
| 5 | df-f 5384 |
. 2
| |
| 6 | df-f 5384 |
. 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 |
| This theorem is used by: feq1d 5523 feq1i 5529 f00 5587 f0bi 5588 f0dom0 5589 fconstg 5592 f1eq1 5596 fconst2g 5933 tfrcllemsucfn 6628 tfrcllemsucaccv 6629 tfrcllembxssdm 6631 tfrcllembfn 6632 tfrcllemex 6635 tfrcllemaccex 6636 tfrcllemres 6637 tfrcl 6639 elmapg 6939 mapfset 6949 fsetsspwxp 6952 ac6sfi 7206 f1setfi 7322 updjud 7428 finomni 7486 exmidomni 7488 mkvprop 7504 1fv 10563 seqf1oglem2 10978 seqf1og 10979 iswrd 11328 isgrpinv 13918 isghm 14105 upxp 15498 txcn 15501 plyf 15963 griedg0prc 16696 dceqnconst 17317 dcapnconst 17318 |
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