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| Mirrors > Home > ILE Home > Th. List > fnssres | GIF version | ||
| Description: Restriction of a function with a subclass of its domain. (Contributed by NM, 2-Aug-1994.) |
| Ref | Expression |
|---|---|
| fnssres | ⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ⊆ 𝐴) → (𝐹 ↾ 𝐵) Fn 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fnssresb 5493 | . 2 ⊢ (𝐹 Fn 𝐴 → ((𝐹 ↾ 𝐵) Fn 𝐵 ↔ 𝐵 ⊆ 𝐴)) | |
| 2 | 1 | biimpar 297 | 1 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐵 ⊆ 𝐴) → (𝐹 ↾ 𝐵) Fn 𝐵) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ⊆ wss 3220 ↾ cres 4774 Fn wfn 5370 |
| 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-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-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3714 df-pr 3715 df-op 3717 df-br 4129 df-opab 4191 df-xp 4778 df-rel 4779 df-cnv 4780 df-co 4781 df-dm 4782 df-res 4784 df-fun 5377 df-fn 5378 |
| This theorem is referenced by: fnssresd 5495 fnresin1 5496 fnresin2 5497 fssres 5563 fvreseq 5806 fnreseql 5813 ffvresb 5865 fnressn 5895 ofres 6311 tfrlem1 6573 frecrdg 6673 resixp 7009 resfnfinfinss 7247 suplocexprlemell 8074 seq3feq2 10896 seqf1oglem2 10940 reeff1 12450 rngmgpf 14219 mgpf 14298 upxp 15356 uptx 15358 cnmpt1st 15372 cnmpt2nd 15373 ioocosf1o 15938 mpodvdsmulf1o 16087 |
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