Theorem elsuppfng 7850

Description: An element of the support of a function with a given domain. This version of elsuppfn 7851 assumes 𝐹 is a set rather than its domain 𝑋, avoiding ax-rep 5160. (Contributed by SN, 5-Aug-2024.)

Assertion

Ref	Expression
elsuppfng	⊢ ((𝐹 Fn 𝑋 ∧ 𝐹 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → (𝑆 ∈ (𝐹 supp 𝑍) ↔ (𝑆 ∈ 𝑋 ∧ (𝐹‘𝑆) ≠ 𝑍)))

Proof of Theorem elsuppfng

Dummy variable 𝑖 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		suppvalfng 7848	. . 3 ⊢ ((𝐹 Fn 𝑋 ∧ 𝐹 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → (𝐹 supp 𝑍) = {𝑖 ∈ 𝑋 ∣ (𝐹‘𝑖) ≠ 𝑍})
2	1	eleq2d 2837	. 2 ⊢ ((𝐹 Fn 𝑋 ∧ 𝐹 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → (𝑆 ∈ (𝐹 supp 𝑍) ↔ 𝑆 ∈ {𝑖 ∈ 𝑋 ∣ (𝐹‘𝑖) ≠ 𝑍}))
3		fveq2 6663	. . . 4 ⊢ (𝑖 = 𝑆 → (𝐹‘𝑖) = (𝐹‘𝑆))
4	3	neeq1d 3010	. . 3 ⊢ (𝑖 = 𝑆 → ((𝐹‘𝑖) ≠ 𝑍 ↔ (𝐹‘𝑆) ≠ 𝑍))
5	4	elrab 3604	. 2 ⊢ (𝑆 ∈ {𝑖 ∈ 𝑋 ∣ (𝐹‘𝑖) ≠ 𝑍} ↔ (𝑆 ∈ 𝑋 ∧ (𝐹‘𝑆) ≠ 𝑍))
6	2, 5	bitrdi 290	1 ⊢ ((𝐹 Fn 𝑋 ∧ 𝐹 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → (𝑆 ∈ (𝐹 supp 𝑍) ↔ (𝑆 ∈ 𝑋 ∧ (𝐹‘𝑆) ≠ 𝑍)))

Syntax hints:   → wi 4   ↔ wb 209   ∧ wa 399   ∧ w3a 1084   = wceq 1538   ∈ wcel 2111   ≠ wne 2951  {crab 3074   Fn wfn 6335  ‘cfv 6340  (class class class)co 7156   supp csupp 7841

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2729  ax-sep 5173  ax-nul 5180  ax-pr 5302  ax-un 7465

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2557  df-eu 2588  df-clab 2736  df-cleq 2750  df-clel 2830  df-nfc 2901  df-ne 2952  df-ral 3075  df-rex 3076  df-rab 3079  df-v 3411  df-sbc 3699  df-dif 3863  df-un 3865  df-in 3867  df-ss 3877  df-nul 4228  df-if 4424  df-sn 4526  df-pr 4528  df-op 4532  df-uni 4802  df-br 5037  df-opab 5099  df-id 5434  df-xp 5534  df-rel 5535  df-cnv 5536  df-co 5537  df-dm 5538  df-rn 5539  df-res 5540  df-ima 5541  df-iota 6299  df-fun 6342  df-fn 6343  df-fv 6348  df-ov 7159  df-oprab 7160  df-mpo 7161  df-supp 7842

This theorem is referenced by:  suppss  7874  suppssrg  7877  ciclcl  17144  cicrcl  17145  ismhp3  20899  mdegleb  24777  suppiniseg  30556