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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 6935 | . . . 4 ⊢ (𝐴 ∈ dom 𝐺 → ((𝐹 ↾ dom 𝐺)‘𝐴) = (𝐹‘𝐴)) | |
| 2 | 1 | eqcomd 2769 | . . 3 ⊢ (𝐴 ∈ dom 𝐺 → (𝐹‘𝐴) = ((𝐹 ↾ dom 𝐺)‘𝐴)) |
| 3 | funssres 6612 | . . . 4 ⊢ ((Fun 𝐹 ∧ 𝐺 ⊆ 𝐹) → (𝐹 ↾ dom 𝐺) = 𝐺) | |
| 4 | 3 | fveq1d 6918 | . . 3 ⊢ ((Fun 𝐹 ∧ 𝐺 ⊆ 𝐹) → ((𝐹 ↾ dom 𝐺)‘𝐴) = (𝐺‘𝐴)) |
| 5 | 2, 4 | sylan9eqr 2820 | . 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 1570 ∈ wcel 2147 ⊆ wss 3900 dom cdm 5658 ↾ cres 5660 Fun wfun 6560 ‘cfv 6566 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-12 2216 ax-ext 2735 ax-sep 5255 ax-pr 5398 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-br 5109 df-opab 5174 df-id 5553 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-res 5670 df-iota 6520 df-fun 6568 df-fv 6574 |
| This theorem is used by: fviunfun 7991 funelss 8093 funsssuppss 8245 frrlem10 8351 tfrlem9 8431 tfrlem11 8434 ac6sfi 9313 axdc3lem2 10568 axdc3lem4 10570 imasvscaval 17760 pserdv 26813 subgruhgredgd 29922 subumgredg2 29923 subupgr 29925 sspn 31395 bnj945 35515 bnj1502 35589 bnj545 35636 bnj548 35638 subfacp1lem2a 36153 subfacp1lem2b 36154 subfacp1lem5 36157 cvmliftlem10 36267 cvmliftlem13 36269 |
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