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| Mirrors > Home > ILE Home > Th. List > fvresi | GIF version | ||
| Description: The value of a restricted identity function. (Contributed by NM, 19-May-2004.) |
| Ref | Expression |
|---|---|
| fvresi | ⊢ (𝐵 ∈ 𝐴 → (( I ↾ 𝐴)‘𝐵) = 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fvres 5714 | . 2 ⊢ (𝐵 ∈ 𝐴 → (( I ↾ 𝐴)‘𝐵) = ( I ‘𝐵)) | |
| 2 | fvi 5754 | . 2 ⊢ (𝐵 ∈ 𝐴 → ( I ‘𝐵) = 𝐵) | |
| 3 | 1, 2 | eqtrd 2271 | 1 ⊢ (𝐵 ∈ 𝐴 → (( I ↾ 𝐴)‘𝐵) = 𝐵) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1402 ∈ wcel 2209 I cid 4428 ↾ cres 4771 ‘cfv 5372 |
| 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 4244 ax-pow 4306 ax-pr 4341 |
| 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-v 2823 df-sbc 3052 df-un 3224 df-in 3226 df-ss 3233 df-pw 3687 df-sn 3711 df-pr 3712 df-op 3714 df-uni 3931 df-br 4126 df-opab 4188 df-id 4433 df-xp 4775 df-rel 4776 df-cnv 4777 df-co 4778 df-dm 4779 df-res 4781 df-iota 5332 df-fun 5374 df-fv 5380 |
| This theorem is referenced by: f1ocnvfv1 5973 f1ocnvfv2 5974 fcof1 5979 fcofo 5980 isoid 6006 iordsmo 6558 omp1eomlem 7424 ctm 7439 ndxarg 13353 idmhm 13753 idghm 14039 dvid 15719 dvidre 15721 |
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