Theorem suppvalbr 7834

Description: The value of the operation constructing the support of a function expressed by binary relations. (Contributed by AV, 7-Apr-2019.)

Assertion

Ref	Expression
suppvalbr	⊢ ((𝑅 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → (𝑅 supp 𝑍) = {𝑥 ∣ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ 𝑦 ≠ 𝑍))})

Distinct variable groups:   𝑥,𝑅,𝑦   𝑥,𝑍,𝑦

Allowed substitution hints:   𝑉(𝑥,𝑦)   𝑊(𝑥,𝑦)

Proof of Theorem suppvalbr

Step	Hyp	Ref	Expression
1		suppval 7832	. 2 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → (𝑅 supp 𝑍) = {𝑥 ∈ dom 𝑅 ∣ (𝑅 “ {𝑥}) ≠ {𝑍}})
2		df-rab 3147	. . . 4 ⊢ {𝑥 ∈ dom 𝑅 ∣ (𝑅 “ {𝑥}) ≠ {𝑍}} = {𝑥 ∣ (𝑥 ∈ dom 𝑅 ∧ (𝑅 “ {𝑥}) ≠ {𝑍})}
3		vex 3497	. . . . . . 7 ⊢ 𝑥 ∈ V
4	3	eldm 5769	. . . . . 6 ⊢ (𝑥 ∈ dom 𝑅 ↔ ∃𝑦 𝑥𝑅𝑦)
5		df-sn 4568	. . . . . . . 8 ⊢ {𝑍} = {𝑦 ∣ 𝑦 = 𝑍}
6	5	neeq2i 3081	. . . . . . 7 ⊢ ({𝑦 ∣ 𝑥𝑅𝑦} ≠ {𝑍} ↔ {𝑦 ∣ 𝑥𝑅𝑦} ≠ {𝑦 ∣ 𝑦 = 𝑍})
7		imasng 5951	. . . . . . . . 9 ⊢ (𝑥 ∈ V → (𝑅 “ {𝑥}) = {𝑦 ∣ 𝑥𝑅𝑦})
8	7	elv 3499	. . . . . . . 8 ⊢ (𝑅 “ {𝑥}) = {𝑦 ∣ 𝑥𝑅𝑦}
9	8	neeq1i 3080	. . . . . . 7 ⊢ ((𝑅 “ {𝑥}) ≠ {𝑍} ↔ {𝑦 ∣ 𝑥𝑅𝑦} ≠ {𝑍})
10		nabbi 3121	. . . . . . 7 ⊢ (∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍) ↔ {𝑦 ∣ 𝑥𝑅𝑦} ≠ {𝑦 ∣ 𝑦 = 𝑍})
11	6, 9, 10	3bitr4i 305	. . . . . 6 ⊢ ((𝑅 “ {𝑥}) ≠ {𝑍} ↔ ∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍))
12	4, 11	anbi12i 628	. . . . 5 ⊢ ((𝑥 ∈ dom 𝑅 ∧ (𝑅 “ {𝑥}) ≠ {𝑍}) ↔ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍)))
13	12	abbii 2886	. . . 4 ⊢ {𝑥 ∣ (𝑥 ∈ dom 𝑅 ∧ (𝑅 “ {𝑥}) ≠ {𝑍})} = {𝑥 ∣ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍))}
14	2, 13	eqtri 2844	. . 3 ⊢ {𝑥 ∈ dom 𝑅 ∣ (𝑅 “ {𝑥}) ≠ {𝑍}} = {𝑥 ∣ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍))}
15	14	a1i 11	. 2 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → {𝑥 ∈ dom 𝑅 ∣ (𝑅 “ {𝑥}) ≠ {𝑍}} = {𝑥 ∣ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍))})
16		df-ne 3017	. . . . . . . 8 ⊢ (𝑦 ≠ 𝑍 ↔ ¬ 𝑦 = 𝑍)
17	16	bicomi 226	. . . . . . 7 ⊢ (¬ 𝑦 = 𝑍 ↔ 𝑦 ≠ 𝑍)
18	17	bibi2i 340	. . . . . 6 ⊢ ((𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍) ↔ (𝑥𝑅𝑦 ↔ 𝑦 ≠ 𝑍))
19	18	exbii 1848	. . . . 5 ⊢ (∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍) ↔ ∃𝑦(𝑥𝑅𝑦 ↔ 𝑦 ≠ 𝑍))
20	19	anbi2i 624	. . . 4 ⊢ ((∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍)) ↔ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ 𝑦 ≠ 𝑍)))
21	20	abbii 2886	. . 3 ⊢ {𝑥 ∣ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍))} = {𝑥 ∣ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ 𝑦 ≠ 𝑍))}
22	21	a1i 11	. 2 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → {𝑥 ∣ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ ¬ 𝑦 = 𝑍))} = {𝑥 ∣ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ 𝑦 ≠ 𝑍))})
23	1, 15, 22	3eqtrd 2860	1 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → (𝑅 supp 𝑍) = {𝑥 ∣ (∃𝑦 𝑥𝑅𝑦 ∧ ∃𝑦(𝑥𝑅𝑦 ↔ 𝑦 ≠ 𝑍))})

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 208   ∧ wa 398   = wceq 1537  ∃wex 1780   ∈ wcel 2114  {cab 2799   ≠ wne 3016  {crab 3142  Vcvv 3494  {csn 4567   class class class wbr 5066  dom cdm 5555   “ cima 5558  (class class class)co 7156   supp csupp 7830

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 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-sep 5203  ax-nul 5210  ax-pr 5330  ax-un 7461

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-sbc 3773  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4839  df-br 5067  df-opab 5129  df-id 5460  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-res 5567  df-ima 5568  df-iota 6314  df-fun 6357  df-fv 6363  df-ov 7159  df-oprab 7160  df-mpo 7161  df-supp 7831

This theorem is referenced by:  suppimacnvss  7840  suppimacnv  7841