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| Mirrors > Home > ILE Home > Th. List > fex | Unicode version | ||
| Description: If the domain of a mapping is a set, the function is a set. (Contributed by NM, 3-Oct-1999.) |
| Ref | Expression |
|---|---|
| fex |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ffn 5531 |
. 2
| |
| 2 | fnex 5931 |
. 2
| |
| 3 | 1, 2 | sylan 283 |
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 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-14 2212 ax-ext 2220 ax-coll 4244 ax-sep 4247 ax-pow 4309 ax-pr 4344 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-reu 2535 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3714 df-pr 3715 df-op 3717 df-uni 3934 df-iun 4012 df-br 4129 df-opab 4191 df-mpt 4192 df-id 4436 df-xp 4778 df-rel 4779 df-cnv 4780 df-co 4781 df-dm 4782 df-rn 4783 df-res 4784 df-ima 4785 df-iota 5335 df-fun 5377 df-fn 5378 df-f 5379 df-f1 5380 df-fo 5381 df-f1o 5382 df-fv 5383 |
| This theorem is referenced by: fexd 5941 fsuppeq 6480 tfrcllembex 6622 tfrcl 6628 f1domg 7037 ffsuppbi 7293 djudom 7426 difinfsn 7433 iseqf1olemjpcl 10926 iseqf1olemfvp 10928 seq3f1olemqsum 10931 seq3f1olemstep 10932 seq3f1olemp 10933 fihashf1rn 11208 climcvg1nlem 12096 fsum3 12135 fprodseq 12331 cnfldstr 14870 cnfldcj 14877 climcncf 15611 upgr2wlkdc 16535 |
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