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| Mirrors > Home > MPE Home > Th. List > funssfv | Structured version Visualization version GIF version | ||
| Description: The value of a member of the domain of a subclass of a function. (Contributed by NM, 15-Aug-1994.) |
| Ref | Expression |
|---|---|
| funssfv | ⊢ ((Fun 𝐹 ∧ 𝐺 ⊆ 𝐹 ∧ 𝐴 ∈ dom 𝐺) → (𝐹‘𝐴) = (𝐺‘𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fvres 6905 | . . . 4 ⊢ (𝐴 ∈ dom 𝐺 → ((𝐹 ↾ dom 𝐺)‘𝐴) = (𝐹‘𝐴)) | |
| 2 | 1 | eqcomd 2766 | . . 3 ⊢ (𝐴 ∈ dom 𝐺 → (𝐹‘𝐴) = ((𝐹 ↾ dom 𝐺)‘𝐴)) |
| 3 | funssres 6585 | . . . 4 ⊢ ((Fun 𝐹 ∧ 𝐺 ⊆ 𝐹) → (𝐹 ↾ dom 𝐺) = 𝐺) | |
| 4 | 3 | fveq1d 6888 | . . 3 ⊢ ((Fun 𝐹 ∧ 𝐺 ⊆ 𝐹) → ((𝐹 ↾ dom 𝐺)‘𝐴) = (𝐺‘𝐴)) |
| 5 | 2, 4 | sylan9eqr 2817 | . 2 ⊢ (((Fun 𝐹 ∧ 𝐺 ⊆ 𝐹) ∧ 𝐴 ∈ dom 𝐺) → (𝐹‘𝐴) = (𝐺‘𝐴)) |
| 6 | 5 | 3impa 1127 | 1 ⊢ ((Fun 𝐹 ∧ 𝐺 ⊆ 𝐹 ∧ 𝐴 ∈ dom 𝐺) → (𝐹‘𝐴) = (𝐺‘𝐴)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∧ w3a 1103 = wceq 1569 ∈ wcel 2144 ⊆ wss 3895 dom cdm 5650 ↾ cres 5652 Fun wfun 6533 ‘cfv 6539 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-pr 5390 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-ss 3896 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-opab 5167 df-id 5545 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-res 5662 df-iota 6494 df-fun 6541 df-fv 6547 |
| This theorem is used by: fviunfun 7958 funelss 8059 funsssuppss 8211 frrlem10 8317 tfrlem9 8397 tfrlem11 8400 ac6sfi 9279 axdc3lem2 10533 axdc3lem4 10535 imasvscaval 17716 pserdv 26762 subgruhgredgd 29871 subumgredg2 29872 subupgr 29874 sspn 31344 bnj945 35451 bnj1502 35525 bnj545 35572 bnj548 35574 subfacp1lem2a 36032 subfacp1lem2b 36033 subfacp1lem5 36036 cvmliftlem10 36146 cvmliftlem13 36148 |
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