fvdifsupp - Mathbox for Thierry Arnoux

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Theorem fvdifsupp 30427

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 3942	. 2 ⊢ (𝜑 → ¬ 𝑋 ∈ (𝐹 supp 𝑍))
3	1	eldifad 3941	. . . 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 7831	. . . . 5 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐴 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → (𝑋 ∈ (𝐹 supp 𝑍) ↔ (𝑋 ∈ 𝐴 ∧ (𝐹‘𝑋) ≠ 𝑍)))
8	4, 5, 6, 7	syl3anc 1366	. . . 4 ⊢ (𝜑 → (𝑋 ∈ (𝐹 supp 𝑍) ↔ (𝑋 ∈ 𝐴 ∧ (𝐹‘𝑋) ≠ 𝑍)))
9	3, 8	mpbirand 705	. . 3 ⊢ (𝜑 → (𝑋 ∈ (𝐹 supp 𝑍) ↔ (𝐹‘𝑋) ≠ 𝑍))
10	9	necon2bbid 3058	. 2 ⊢ (𝜑 → ((𝐹‘𝑋) = 𝑍 ↔ ¬ 𝑋 ∈ (𝐹 supp 𝑍)))
11	2, 10	mpbird 259	1 ⊢ (𝜑 → (𝐹‘𝑋) = 𝑍)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 208 ∧ wa 398 = wceq 1536 ∈ wcel 2113 ≠ wne 3015 ∖ cdif 3926 Fn wfn 6343 ‘cfv 6348 (class class class)co 7149 supp csupp 7823

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2792 ax-rep 5183 ax-sep 5196 ax-nul 5203 ax-pr 5323 ax-un 7454

This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1084 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-mo 2621 df-eu 2653 df-clab 2799 df-cleq 2813 df-clel 2892 df-nfc 2962 df-ne 3016 df-ral 3142 df-rex 3143 df-reu 3144 df-rab 3146 df-v 3493 df-sbc 3769 df-csb 3877 df-dif 3932 df-un 3934 df-in 3936 df-ss 3945 df-nul 4285 df-if 4461 df-sn 4561 df-pr 4563 df-op 4567 df-uni 4832 df-iun 4914 df-br 5060 df-opab 5122 df-mpt 5140 df-id 5453 df-xp 5554 df-rel 5555 df-cnv 5556 df-co 5557 df-dm 5558 df-rn 5559 df-res 5560 df-ima 5561 df-iota 6307 df-fun 6350 df-fn 6351 df-f 6352 df-f1 6353 df-fo 6354 df-f1o 6355 df-fv 6356 df-ov 7152 df-oprab 7153 df-mpo 7154 df-supp 7824

This theorem is referenced by: (None)

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