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Theorem suppssr 8181

Description: A function is zero outside its support. (Contributed by Mario Carneiro, 19-Dec-2014.) (Revised by AV, 28-May-2019.)

**Hypotheses**
Ref	Expression
suppssr.f	⊢ (𝜑 → 𝐹:𝐴⟶𝐵)
suppssr.n	⊢ (𝜑 → (𝐹 supp 𝑍) ⊆ 𝑊)
suppssr.a	⊢ (𝜑 → 𝐴 ∈ 𝑉)
suppssr.z	⊢ (𝜑 → 𝑍 ∈ 𝑈)

**Assertion**
Ref	Expression
suppssr	⊢ ((𝜑 ∧ 𝑋 ∈ (𝐴 ∖ 𝑊)) → (𝐹‘𝑋) = 𝑍)

**Proof of Theorem suppssr**
Step	Hyp	Ref	Expression
1		eldif 3959	. 2 ⊢ (𝑋 ∈ (𝐴 ∖ 𝑊) ↔ (𝑋 ∈ 𝐴 ∧ ¬ 𝑋 ∈ 𝑊))
2		fvex 6905	. . . . . 6 ⊢ (𝐹‘𝑋) ∈ V
3		eldifsn 4791	. . . . . 6 ⊢ ((𝐹‘𝑋) ∈ (V ∖ {𝑍}) ↔ ((𝐹‘𝑋) ∈ V ∧ (𝐹‘𝑋) ≠ 𝑍))
4	2, 3	mpbiran 708	. . . . 5 ⊢ ((𝐹‘𝑋) ∈ (V ∖ {𝑍}) ↔ (𝐹‘𝑋) ≠ 𝑍)
5		suppssr.f	. . . . . . . . . 10 ⊢ (𝜑 → 𝐹:𝐴⟶𝐵)
6	5	ffnd 6719	. . . . . . . . 9 ⊢ (𝜑 → 𝐹 Fn 𝐴)
7		suppssr.a	. . . . . . . . 9 ⊢ (𝜑 → 𝐴 ∈ 𝑉)
8		suppssr.z	. . . . . . . . 9 ⊢ (𝜑 → 𝑍 ∈ 𝑈)
9		elsuppfn 8156	. . . . . . . . 9 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐴 ∈ 𝑉 ∧ 𝑍 ∈ 𝑈) → (𝑋 ∈ (𝐹 supp 𝑍) ↔ (𝑋 ∈ 𝐴 ∧ (𝐹‘𝑋) ≠ 𝑍)))
10	6, 7, 8, 9	syl3anc 1372	. . . . . . . 8 ⊢ (𝜑 → (𝑋 ∈ (𝐹 supp 𝑍) ↔ (𝑋 ∈ 𝐴 ∧ (𝐹‘𝑋) ≠ 𝑍)))
11		ibar 530	. . . . . . . . . . 11 ⊢ ((𝐹‘𝑋) ∈ V → ((𝐹‘𝑋) ≠ 𝑍 ↔ ((𝐹‘𝑋) ∈ V ∧ (𝐹‘𝑋) ≠ 𝑍)))
12	2, 11	mp1i 13	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑋 ∈ 𝐴) → ((𝐹‘𝑋) ≠ 𝑍 ↔ ((𝐹‘𝑋) ∈ V ∧ (𝐹‘𝑋) ≠ 𝑍)))
13	12, 3	bitr4di 289	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑋 ∈ 𝐴) → ((𝐹‘𝑋) ≠ 𝑍 ↔ (𝐹‘𝑋) ∈ (V ∖ {𝑍})))
14	13	pm5.32da 580	. . . . . . . 8 ⊢ (𝜑 → ((𝑋 ∈ 𝐴 ∧ (𝐹‘𝑋) ≠ 𝑍) ↔ (𝑋 ∈ 𝐴 ∧ (𝐹‘𝑋) ∈ (V ∖ {𝑍}))))
15	10, 14	bitrd 279	. . . . . . 7 ⊢ (𝜑 → (𝑋 ∈ (𝐹 supp 𝑍) ↔ (𝑋 ∈ 𝐴 ∧ (𝐹‘𝑋) ∈ (V ∖ {𝑍}))))
16		suppssr.n	. . . . . . . 8 ⊢ (𝜑 → (𝐹 supp 𝑍) ⊆ 𝑊)
17	16	sseld 3982	. . . . . . 7 ⊢ (𝜑 → (𝑋 ∈ (𝐹 supp 𝑍) → 𝑋 ∈ 𝑊))
18	15, 17	sylbird 260	. . . . . 6 ⊢ (𝜑 → ((𝑋 ∈ 𝐴 ∧ (𝐹‘𝑋) ∈ (V ∖ {𝑍})) → 𝑋 ∈ 𝑊))
19	18	expdimp 454	. . . . 5 ⊢ ((𝜑 ∧ 𝑋 ∈ 𝐴) → ((𝐹‘𝑋) ∈ (V ∖ {𝑍}) → 𝑋 ∈ 𝑊))
20	4, 19	biimtrrid 242	. . . 4 ⊢ ((𝜑 ∧ 𝑋 ∈ 𝐴) → ((𝐹‘𝑋) ≠ 𝑍 → 𝑋 ∈ 𝑊))
21	20	necon1bd 2959	. . 3 ⊢ ((𝜑 ∧ 𝑋 ∈ 𝐴) → (¬ 𝑋 ∈ 𝑊 → (𝐹‘𝑋) = 𝑍))
22	21	impr 456	. 2 ⊢ ((𝜑 ∧ (𝑋 ∈ 𝐴 ∧ ¬ 𝑋 ∈ 𝑊)) → (𝐹‘𝑋) = 𝑍)
23	1, 22	sylan2b 595	1 ⊢ ((𝜑 ∧ 𝑋 ∈ (𝐴 ∖ 𝑊)) → (𝐹‘𝑋) = 𝑍)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 397 = wceq 1542 ∈ wcel 2107 ≠ wne 2941 Vcvv 3475 ∖ cdif 3946 ⊆ wss 3949 {csn 4629 Fn wfn 6539 ⟶wf 6540 ‘cfv 6544 (class class class)co 7409 supp csupp 8146

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-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pr 5428 ax-un 7725

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-nfc 2886 df-ne 2942 df-ral 3063 df-rex 3072 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 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-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-id 5575 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-ov 7412 df-oprab 7413 df-mpo 7414 df-supp 8147

This theorem is referenced by: fsuppmptif 9394 fsuppco2 9398 fsuppcor 9399 cantnfp1lem1 9673 cantnfp1lem3 9675 cantnflem1 9684 cnfcom2lem 9696 gsumval3 19775 gsumcllem 19776 gsumzaddlem 19789 gsumzmhm 19805 gsumpt 19830 gsum2dlem1 19838 gsum2dlem2 19839 gsum2d 19840 gsumxp2 19848 dprdfinv 19889 dprdfadd 19890 dmdprdsplitlem 19907 dpjidcl 19928 gsumdixp 20131 lcomfsupp 20512 uvcresum 21348 frlmsslsp 21351 psrbaglesuppOLD 21478 psrbagaddclOLD 21482 psrbaglefiOLD 21486 mplsubglem 21558 mpllsslem 21559 mplsubrglem 21563 mplmonmul 21591 mplcoe1 21592 mplcoe5 21595 mplbas2 21597 evlslem4 21637 evlslem2 21642 mhpmulcl 21692 mhpvscacl 21697 rrxcph 24909 rrxmval 24922 rrxmetlem 24924 rrxmet 24925 rrxdstprj1 24926 deg1mul3le 25634 suppovss 31906 elrspunidl 32546 fedgmullem1 32714 eulerpartlemb 33367 evlsvvvallem 41133 evlsvvval 41135 evlselv 41159 fsuppssindlem1 41163 evlsmhpvvval 41167

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