fvdifsupp - Mathbox for Thierry Arnoux

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Theorem fvdifsupp 31884

Description: Function value is zero outside of its support. (Contributed by Thierry Arnoux, 21-Jan-2024.)

**Hypotheses**
Ref	Expression
fvdifsupp.1	⊢ (𝜑 → 𝐹 Fn 𝐴)
fvdifsupp.2	⊢ (𝜑 → 𝐴 ∈ 𝑉)
fvdifsupp.3	⊢ (𝜑 → 𝑍 ∈ 𝑊)
fvdifsupp.4	⊢ (𝜑 → 𝑋 ∈ (𝐴 ∖ (𝐹 supp 𝑍)))

**Assertion**
Ref	Expression
fvdifsupp	⊢ (𝜑 → (𝐹‘𝑋) = 𝑍)

**Proof of Theorem fvdifsupp**
Step	Hyp	Ref	Expression
1		fvdifsupp.4	. . 3 ⊢ (𝜑 → 𝑋 ∈ (𝐴 ∖ (𝐹 supp 𝑍)))
2	1	eldifbd 3959	. 2 ⊢ (𝜑 → ¬ 𝑋 ∈ (𝐹 supp 𝑍))
3	1	eldifad 3958	. . . 4 ⊢ (𝜑 → 𝑋 ∈ 𝐴)
4		fvdifsupp.1	. . . . 5 ⊢ (𝜑 → 𝐹 Fn 𝐴)
5		fvdifsupp.2	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ 𝑉)
6		fvdifsupp.3	. . . . 5 ⊢ (𝜑 → 𝑍 ∈ 𝑊)
7		elsuppfn 8150	. . . . 5 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐴 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → (𝑋 ∈ (𝐹 supp 𝑍) ↔ (𝑋 ∈ 𝐴 ∧ (𝐹‘𝑋) ≠ 𝑍)))
8	4, 5, 6, 7	syl3anc 1372	. . . 4 ⊢ (𝜑 → (𝑋 ∈ (𝐹 supp 𝑍) ↔ (𝑋 ∈ 𝐴 ∧ (𝐹‘𝑋) ≠ 𝑍)))
9	3, 8	mpbirand 706	. . 3 ⊢ (𝜑 → (𝑋 ∈ (𝐹 supp 𝑍) ↔ (𝐹‘𝑋) ≠ 𝑍))
10	9	necon2bbid 2985	. 2 ⊢ (𝜑 → ((𝐹‘𝑋) = 𝑍 ↔ ¬ 𝑋 ∈ (𝐹 supp 𝑍)))
11	2, 10	mpbird 257	1 ⊢ (𝜑 → (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 ∖ cdif 3943 Fn wfn 6534 ‘cfv 6539 (class class class)co 7403 supp csupp 8140

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 5283 ax-sep 5297 ax-nul 5304 ax-pr 5425 ax-un 7719

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 3776 df-csb 3892 df-dif 3949 df-un 3951 df-in 3953 df-ss 3963 df-nul 4321 df-if 4527 df-sn 4627 df-pr 4629 df-op 4633 df-uni 4907 df-iun 4997 df-br 5147 df-opab 5209 df-mpt 5230 df-id 5572 df-xp 5680 df-rel 5681 df-cnv 5682 df-co 5683 df-dm 5684 df-rn 5685 df-res 5686 df-ima 5687 df-iota 6491 df-fun 6541 df-fn 6542 df-f 6543 df-f1 6544 df-fo 6545 df-f1o 6546 df-fv 6547 df-ov 7406 df-oprab 7407 df-mpo 7408 df-supp 8141

This theorem is referenced by: fdifsuppconst 31888 elrspunidl 32503 elrspunsn 32504 evls1fpws 32595

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