funssfv - Metamath Proof Explorer

	Metamath Proof Explorer		< Previous Next > Nearby theorems
Mirrors > Home > MPE Home > Th. List > funssfv		Structured version Visualization version GIF version

Theorem funssfv 6913

Description: The value of a member of the domain of a subclass of a function. (Contributed by NM, 15-Aug-1994.)

**Assertion**
Ref	Expression
funssfv	⊢ ((Fun 𝐹 ∧ 𝐺 ⊆ 𝐹 ∧ 𝐴 ∈ dom 𝐺) → (𝐹‘𝐴) = (𝐺‘𝐴))

**Proof of Theorem funssfv**
Step	Hyp	Ref	Expression
1		fvres 6911	. . . 4 ⊢ (𝐴 ∈ dom 𝐺 → ((𝐹 ↾ dom 𝐺)‘𝐴) = (𝐹‘𝐴))
2	1	eqcomd 2739	. . 3 ⊢ (𝐴 ∈ dom 𝐺 → (𝐹‘𝐴) = ((𝐹 ↾ dom 𝐺)‘𝐴))
3		funssres 6593	. . . 4 ⊢ ((Fun 𝐹 ∧ 𝐺 ⊆ 𝐹) → (𝐹 ↾ dom 𝐺) = 𝐺)
4	3	fveq1d 6894	. . 3 ⊢ ((Fun 𝐹 ∧ 𝐺 ⊆ 𝐹) → ((𝐹 ↾ dom 𝐺)‘𝐴) = (𝐺‘𝐴))
5	2, 4	sylan9eqr 2795	. 2 ⊢ (((Fun 𝐹 ∧ 𝐺 ⊆ 𝐹) ∧ 𝐴 ∈ dom 𝐺) → (𝐹‘𝐴) = (𝐺‘𝐴))
6	5	3impa 1111	1 ⊢ ((Fun 𝐹 ∧ 𝐺 ⊆ 𝐹 ∧ 𝐴 ∈ dom 𝐺) → (𝐹‘𝐴) = (𝐺‘𝐴))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 397 ∧ w3a 1088 = wceq 1542 ∈ wcel 2107 ⊆ wss 3949 dom cdm 5677 ↾ cres 5679 Fun wfun 6538 ‘cfv 6544

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-12 2172 ax-ext 2704 ax-sep 5300 ax-nul 5307 ax-pr 5428

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-ral 3063 df-rex 3072 df-rab 3434 df-v 3477 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-nul 4324 df-if 4530 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-br 5150 df-opab 5212 df-id 5575 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-res 5689 df-iota 6496 df-fun 6546 df-fv 6552

This theorem is referenced by: fviunfun 7931 funelss 8033 funsssuppss 8175 frrlem10 8280 wfrlem12OLD 8320 wfrlem14OLD 8322 tfrlem9 8385 tfrlem11 8388 ac6sfi 9287 axdc3lem2 10446 axdc3lem4 10448 imasvscaval 17484 pserdv 25941 subgruhgredgd 28541 subumgredg2 28542 subupgr 28544 sspn 29989 bnj945 33784 bnj1502 33859 bnj545 33906 bnj548 33908 subfacp1lem2a 34171 subfacp1lem2b 34172 subfacp1lem5 34175 cvmliftlem10 34285 cvmliftlem13 34287