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Theorem suppssr 8125

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 3907	. 2 ⊢ (𝑋 ∈ (𝐴 ∖ 𝑊) ↔ (𝑋 ∈ 𝐴 ∧ ¬ 𝑋 ∈ 𝑊))
2		fvex 6835	. . . . . 6 ⊢ (𝐹‘𝑋) ∈ V
3		eldifsn 4735	. . . . . 6 ⊢ ((𝐹‘𝑋) ∈ (V ∖ {𝑍}) ↔ ((𝐹‘𝑋) ∈ V ∧ (𝐹‘𝑋) ≠ 𝑍))
4	2, 3	mpbiran 709	. . . . 5 ⊢ ((𝐹‘𝑋) ∈ (V ∖ {𝑍}) ↔ (𝐹‘𝑋) ≠ 𝑍)
5		suppssr.f	. . . . . . . . . 10 ⊢ (𝜑 → 𝐹:𝐴⟶𝐵)
6	5	ffnd 6652	. . . . . . . . 9 ⊢ (𝜑 → 𝐹 Fn 𝐴)
7		suppssr.a	. . . . . . . . 9 ⊢ (𝜑 → 𝐴 ∈ 𝑉)
8		suppssr.z	. . . . . . . . 9 ⊢ (𝜑 → 𝑍 ∈ 𝑈)
9		elsuppfn 8100	. . . . . . . . 9 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐴 ∈ 𝑉 ∧ 𝑍 ∈ 𝑈) → (𝑋 ∈ (𝐹 supp 𝑍) ↔ (𝑋 ∈ 𝐴 ∧ (𝐹‘𝑋) ≠ 𝑍)))
10	6, 7, 8, 9	syl3anc 1373	. . . . . . . 8 ⊢ (𝜑 → (𝑋 ∈ (𝐹 supp 𝑍) ↔ (𝑋 ∈ 𝐴 ∧ (𝐹‘𝑋) ≠ 𝑍)))
11		ibar 528	. . . . . . . . . . 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 579	. . . . . . . 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 3928	. . . . . . 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 452	. . . . 5 ⊢ ((𝜑 ∧ 𝑋 ∈ 𝐴) → ((𝐹‘𝑋) ∈ (V ∖ {𝑍}) → 𝑋 ∈ 𝑊))
20	4, 19	biimtrrid 243	. . . 4 ⊢ ((𝜑 ∧ 𝑋 ∈ 𝐴) → ((𝐹‘𝑋) ≠ 𝑍 → 𝑋 ∈ 𝑊))
21	20	necon1bd 2946	. . 3 ⊢ ((𝜑 ∧ 𝑋 ∈ 𝐴) → (¬ 𝑋 ∈ 𝑊 → (𝐹‘𝑋) = 𝑍))
22	21	impr 454	. 2 ⊢ ((𝜑 ∧ (𝑋 ∈ 𝐴 ∧ ¬ 𝑋 ∈ 𝑊)) → (𝐹‘𝑋) = 𝑍)
23	1, 22	sylan2b 594	1 ⊢ ((𝜑 ∧ 𝑋 ∈ (𝐴 ∖ 𝑊)) → (𝐹‘𝑋) = 𝑍)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1541 ∈ wcel 2111 ≠ wne 2928 Vcvv 3436 ∖ cdif 3894 ⊆ wss 3897 {csn 4573 Fn wfn 6476 ⟶wf 6477 ‘cfv 6481 (class class class)co 7346 supp csupp 8090

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-rep 5215 ax-sep 5232 ax-nul 5242 ax-pr 5368 ax-un 7668

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-ral 3048 df-rex 3057 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3737 df-csb 3846 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-nul 4281 df-if 4473 df-pw 4549 df-sn 4574 df-pr 4576 df-op 4580 df-uni 4857 df-iun 4941 df-br 5090 df-opab 5152 df-mpt 5171 df-id 5509 df-xp 5620 df-rel 5621 df-cnv 5622 df-co 5623 df-dm 5624 df-rn 5625 df-res 5626 df-ima 5627 df-iota 6437 df-fun 6483 df-fn 6484 df-f 6485 df-f1 6486 df-fo 6487 df-f1o 6488 df-fv 6489 df-ov 7349 df-oprab 7350 df-mpo 7351 df-supp 8091

This theorem is referenced by: fsuppmptif 9283 fsuppco2 9287 fsuppcor 9288 cantnfp1lem1 9568 cantnfp1lem3 9570 cantnflem1 9579 cnfcom2lem 9591 gsumval3 19819 gsumcllem 19820 gsumzaddlem 19833 gsumzmhm 19849 gsumpt 19874 gsum2dlem1 19882 gsum2dlem2 19883 gsum2d 19884 gsumxp2 19892 dprdfinv 19933 dprdfadd 19934 dmdprdsplitlem 19951 dpjidcl 19972 gsumdixp 20237 lcomfsupp 20835 uvcresum 21730 frlmsslsp 21733 mplsubglem 21936 mpllsslem 21937 mplsubrglem 21941 mplmonmul 21971 mplcoe1 21972 mplcoe5 21975 mplbas2 21977 evlslem4 22011 evlslem2 22014 rrxcph 25319 rrxmval 25332 rrxmetlem 25334 rrxmet 25335 rrxdstprj1 25336 deg1mul3le 26049 suppovss 32662 elrspunidl 33393 fedgmullem1 33642 eulerpartlemb 34381 evlsvvvallem 42653 evlsvvval 42655 evlselv 42679 fsuppssindlem1 42683 evlsmhpvvval 42687

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