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Theorem suppssr 8137

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 3911	. 2 ⊢ (𝑋 ∈ (𝐴 ∖ 𝑊) ↔ (𝑋 ∈ 𝐴 ∧ ¬ 𝑋 ∈ 𝑊))
2		fvex 6847	. . . . . 6 ⊢ (𝐹‘𝑋) ∈ V
3		eldifsn 4742	. . . . . 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 6663	. . . . . . . . 9 ⊢ (𝜑 → 𝐹 Fn 𝐴)
7		suppssr.a	. . . . . . . . 9 ⊢ (𝜑 → 𝐴 ∈ 𝑉)
8		suppssr.z	. . . . . . . . 9 ⊢ (𝜑 → 𝑍 ∈ 𝑈)
9		elsuppfn 8112	. . . . . . . . 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 3932	. . . . . . 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 2950	. . 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 2113 ≠ wne 2932 Vcvv 3440 ∖ cdif 3898 ⊆ wss 3901 {csn 4580 Fn wfn 6487 ⟶wf 6488 ‘cfv 6492 (class class class)co 7358 supp csupp 8102

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 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-rep 5224 ax-sep 5241 ax-nul 5251 ax-pr 5377 ax-un 7680

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 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3061 df-reu 3351 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-iun 4948 df-br 5099 df-opab 5161 df-mpt 5180 df-id 5519 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-ov 7361 df-oprab 7362 df-mpo 7363 df-supp 8103

This theorem is referenced by: fsuppmptif 9302 fsuppco2 9306 fsuppcor 9307 cantnfp1lem1 9587 cantnfp1lem3 9589 cantnflem1 9598 cnfcom2lem 9610 gsumval3 19836 gsumcllem 19837 gsumzaddlem 19850 gsumzmhm 19866 gsumpt 19891 gsum2dlem1 19899 gsum2dlem2 19900 gsum2d 19901 gsumxp2 19909 dprdfinv 19950 dprdfadd 19951 dmdprdsplitlem 19968 dpjidcl 19989 gsumdixp 20254 lcomfsupp 20853 uvcresum 21748 frlmsslsp 21751 mplsubglem 21954 mpllsslem 21955 mplsubrglem 21959 mplmonmul 21991 mplcoe1 21992 mplcoe5 21995 mplbas2 21997 evlslem4 22031 evlslem2 22034 evlsvvvallem 22046 evlsvvval 22048 rrxcph 25348 rrxmval 25361 rrxmetlem 25363 rrxmet 25364 rrxdstprj1 25365 deg1mul3le 26078 suppovss 32760 elrspunidl 33509 fedgmullem1 33786 eulerpartlemb 34525 evlselv 42826 fsuppssindlem1 42830 evlsmhpvvval 42834

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