Theorem cnfldfun 21722

Description: The field of complex numbers is a function. The proof is much shorter than the proof of cnfldfunALT 21723 by using cnfldstr 21710 and structn0fun 17358: in addition, it must be shown that ∅ ∉ ℂ_fld. (Contributed by AV, 18-Nov-2021.) Revise df-cnfld 21709. (Revised by GG, 31-Mar-2025.)

Assertion

Ref	Expression
cnfldfun	⊢ Fun ℂfld

Proof of Theorem cnfldfun

Dummy variables 𝑣 𝑢 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		cnfldstr 21710	. 2 ⊢ ℂfld Struct ⟨1, ;13⟩
2		structn0fun 17358	. . 3 ⊢ (ℂfld Struct ⟨1, ;13⟩ → Fun (ℂfld ∖ {∅}))
3		fvex 6921	. . . . . . . . . . . . 13 ⊢ (Base‘ndx) ∈ V
4		cnex 11308	. . . . . . . . . . . . 13 ⊢ ℂ ∈ V
5	3, 4	opnzi 5447	. . . . . . . . . . . 12 ⊢ ⟨(Base‘ndx), ℂ⟩ ≠ ∅
6	5	nesymi 3016	. . . . . . . . . . 11 ⊢ ¬ ∅ = ⟨(Base‘ndx), ℂ⟩
7		fvex 6921	. . . . . . . . . . . . 13 ⊢ (+g‘ndx) ∈ V
8		mpoaddex 13143	. . . . . . . . . . . . 13 ⊢ (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣)) ∈ V
9	7, 8	opnzi 5447	. . . . . . . . . . . 12 ⊢ ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩ ≠ ∅
10	9	nesymi 3016	. . . . . . . . . . 11 ⊢ ¬ ∅ = ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩
11		fvex 6921	. . . . . . . . . . . . 13 ⊢ (.r‘ndx) ∈ V
12		mpomulex 13145	. . . . . . . . . . . . 13 ⊢ (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣)) ∈ V
13	11, 12	opnzi 5447	. . . . . . . . . . . 12 ⊢ ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩ ≠ ∅
14	13	nesymi 3016	. . . . . . . . . . 11 ⊢ ¬ ∅ = ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩
15		3ioran 1123	. . . . . . . . . . . 12 ⊢ (¬ (∅ = ⟨(Base‘ndx), ℂ⟩ ∨ ∅ = ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩ ∨ ∅ = ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩) ↔ (¬ ∅ = ⟨(Base‘ndx), ℂ⟩ ∧ ¬ ∅ = ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩ ∧ ¬ ∅ = ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩))
16		0ex 5264	. . . . . . . . . . . . 13 ⊢ ∅ ∈ V
17	16	eltp 4650	. . . . . . . . . . . 12 ⊢ (∅ ∈ {⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ↔ (∅ = ⟨(Base‘ndx), ℂ⟩ ∨ ∅ = ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩ ∨ ∅ = ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩))
18	15, 17	xchnxbir 336	. . . . . . . . . . 11 ⊢ (¬ ∅ ∈ {⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ↔ (¬ ∅ = ⟨(Base‘ndx), ℂ⟩ ∧ ¬ ∅ = ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩ ∧ ¬ ∅ = ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩))
19	6, 10, 14, 18	mpbir3an 1360	. . . . . . . . . 10 ⊢ ¬ ∅ ∈ {⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩}
20		fvex 6921	. . . . . . . . . . . . 13 ⊢ (*𝑟‘ndx) ∈ V
21		cjf 15300	. . . . . . . . . . . . . 14 ⊢ ∗:ℂ⟶ℂ
22		fex 7255	. . . . . . . . . . . . . 14 ⊢ ((∗:ℂ⟶ℂ ∧ ℂ ∈ V) → ∗ ∈ V)
23	21, 4, 22	mp2an 705	. . . . . . . . . . . . 13 ⊢ ∗ ∈ V
24	20, 23	opnzi 5447	. . . . . . . . . . . 12 ⊢ ⟨(*𝑟‘ndx), ∗⟩ ≠ ∅
25	24	necomi 3013	. . . . . . . . . . 11 ⊢ ∅ ≠ ⟨(*𝑟‘ndx), ∗⟩
26		nelsn 4627	. . . . . . . . . . 11 ⊢ (∅ ≠ ⟨(*𝑟‘ndx), ∗⟩ → ¬ ∅ ∈ {⟨(*𝑟‘ndx), ∗⟩})
27	25, 26	ax-mp 5	. . . . . . . . . 10 ⊢ ¬ ∅ ∈ {⟨(*𝑟‘ndx), ∗⟩}
28	19, 27	pm3.2i 476	. . . . . . . . 9 ⊢ (¬ ∅ ∈ {⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∧ ¬ ∅ ∈ {⟨(*𝑟‘ndx), ∗⟩})
29		fvex 6921	. . . . . . . . . . . . . 14 ⊢ (TopSet‘ndx) ∈ V
30		fvex 6921	. . . . . . . . . . . . . 14 ⊢ (MetOpen‘(abs ∘ − )) ∈ V
31	29, 30	opnzi 5447	. . . . . . . . . . . . 13 ⊢ ⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩ ≠ ∅
32	31	nesymi 3016	. . . . . . . . . . . 12 ⊢ ¬ ∅ = ⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩
33		fvex 6921	. . . . . . . . . . . . . 14 ⊢ (le‘ndx) ∈ V
34		letsr 18796	. . . . . . . . . . . . . . 15 ⊢ ≤ ∈ TosetRel
35	34	elexi 3476	. . . . . . . . . . . . . 14 ⊢ ≤ ∈ V
36	33, 35	opnzi 5447	. . . . . . . . . . . . 13 ⊢ ⟨(le‘ndx), ≤ ⟩ ≠ ∅
37	36	nesymi 3016	. . . . . . . . . . . 12 ⊢ ¬ ∅ = ⟨(le‘ndx), ≤ ⟩
38		fvex 6921	. . . . . . . . . . . . . 14 ⊢ (dist‘ndx) ∈ V
39		absf 15534	. . . . . . . . . . . . . . . 16 ⊢ abs:ℂ⟶ℝ
40		fex 7255	. . . . . . . . . . . . . . . 16 ⊢ ((abs:ℂ⟶ℝ ∧ ℂ ∈ V) → abs ∈ V)
41	39, 4, 40	mp2an 705	. . . . . . . . . . . . . . 15 ⊢ abs ∈ V
42		subf 11586	. . . . . . . . . . . . . . . 16 ⊢ − :(ℂ × ℂ)⟶ℂ
43	4, 4	xpex 7791	. . . . . . . . . . . . . . . 16 ⊢ (ℂ × ℂ) ∈ V
44		fex 7255	. . . . . . . . . . . . . . . 16 ⊢ (( − :(ℂ × ℂ)⟶ℂ ∧ (ℂ × ℂ) ∈ V) → − ∈ V)
45	42, 43, 44	mp2an 705	. . . . . . . . . . . . . . 15 ⊢ − ∈ V
46	41, 45	coex 7966	. . . . . . . . . . . . . 14 ⊢ (abs ∘ − ) ∈ V
47	38, 46	opnzi 5447	. . . . . . . . . . . . 13 ⊢ ⟨(dist‘ndx), (abs ∘ − )⟩ ≠ ∅
48	47	nesymi 3016	. . . . . . . . . . . 12 ⊢ ¬ ∅ = ⟨(dist‘ndx), (abs ∘ − )⟩
49	32, 37, 48	3pm3.2ni 1519	. . . . . . . . . . 11 ⊢ ¬ (∅ = ⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩ ∨ ∅ = ⟨(le‘ndx), ≤ ⟩ ∨ ∅ = ⟨(dist‘ndx), (abs ∘ − )⟩)
50	16	eltp 4650	. . . . . . . . . . 11 ⊢ (∅ ∈ {⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ↔ (∅ = ⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩ ∨ ∅ = ⟨(le‘ndx), ≤ ⟩ ∨ ∅ = ⟨(dist‘ndx), (abs ∘ − )⟩))
51	49, 50	mtbir 326	. . . . . . . . . 10 ⊢ ¬ ∅ ∈ {⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩}
52		fvex 6921	. . . . . . . . . . . . 13 ⊢ (UnifSet‘ndx) ∈ V
53		fvex 6921	. . . . . . . . . . . . 13 ⊢ (metUnif‘(abs ∘ − )) ∈ V
54	52, 53	opnzi 5447	. . . . . . . . . . . 12 ⊢ ⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩ ≠ ∅
55	54	necomi 3013	. . . . . . . . . . 11 ⊢ ∅ ≠ ⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩
56		nelsn 4627	. . . . . . . . . . 11 ⊢ (∅ ≠ ⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩ → ¬ ∅ ∈ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩})
57	55, 56	ax-mp 5	. . . . . . . . . 10 ⊢ ¬ ∅ ∈ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩}
58	51, 57	pm3.2i 476	. . . . . . . . 9 ⊢ (¬ ∅ ∈ {⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∧ ¬ ∅ ∈ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩})
59	28, 58	pm3.2i 476	. . . . . . . 8 ⊢ ((¬ ∅ ∈ {⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∧ ¬ ∅ ∈ {⟨(*𝑟‘ndx), ∗⟩}) ∧ (¬ ∅ ∈ {⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∧ ¬ ∅ ∈ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩}))
60		ioran 999	. . . . . . . . 9 ⊢ (¬ ((∅ ∈ {⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∨ ∅ ∈ {⟨(*𝑟‘ndx), ∗⟩}) ∨ (∅ ∈ {⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∨ ∅ ∈ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩})) ↔ (¬ (∅ ∈ {⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∨ ∅ ∈ {⟨(*𝑟‘ndx), ∗⟩}) ∧ ¬ (∅ ∈ {⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∨ ∅ ∈ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩})))
61		ioran 999	. . . . . . . . . 10 ⊢ (¬ (∅ ∈ {⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∨ ∅ ∈ {⟨(*𝑟‘ndx), ∗⟩}) ↔ (¬ ∅ ∈ {⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∧ ¬ ∅ ∈ {⟨(*𝑟‘ndx), ∗⟩}))
62		ioran 999	. . . . . . . . . 10 ⊢ (¬ (∅ ∈ {⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∨ ∅ ∈ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩}) ↔ (¬ ∅ ∈ {⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∧ ¬ ∅ ∈ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩}))
63	61, 62	anbi12i 640	. . . . . . . . 9 ⊢ ((¬ (∅ ∈ {⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∨ ∅ ∈ {⟨(*𝑟‘ndx), ∗⟩}) ∧ ¬ (∅ ∈ {⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∨ ∅ ∈ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩})) ↔ ((¬ ∅ ∈ {⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∧ ¬ ∅ ∈ {⟨(*𝑟‘ndx), ∗⟩}) ∧ (¬ ∅ ∈ {⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∧ ¬ ∅ ∈ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩})))
64	60, 63	bitri 278	. . . . . . . 8 ⊢ (¬ ((∅ ∈ {⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∨ ∅ ∈ {⟨(*𝑟‘ndx), ∗⟩}) ∨ (∅ ∈ {⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∨ ∅ ∈ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩})) ↔ ((¬ ∅ ∈ {⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∧ ¬ ∅ ∈ {⟨(*𝑟‘ndx), ∗⟩}) ∧ (¬ ∅ ∈ {⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∧ ¬ ∅ ∈ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩})))
65	59, 64	mpbir 234	. . . . . . 7 ⊢ ¬ ((∅ ∈ {⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∨ ∅ ∈ {⟨(*𝑟‘ndx), ∗⟩}) ∨ (∅ ∈ {⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∨ ∅ ∈ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩}))
66		df-cnfld 21709	. . . . . . . . 9 ⊢ ℂfld = (({⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∪ {⟨(*𝑟‘ndx), ∗⟩}) ∪ ({⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∪ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩}))
67	66	eleq2i 2856	. . . . . . . 8 ⊢ (∅ ∈ ℂfld ↔ ∅ ∈ (({⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∪ {⟨(*𝑟‘ndx), ∗⟩}) ∪ ({⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∪ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩})))
68		elun 4155	. . . . . . . 8 ⊢ (∅ ∈ (({⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∪ {⟨(*𝑟‘ndx), ∗⟩}) ∪ ({⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∪ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩})) ↔ (∅ ∈ ({⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∪ {⟨(*𝑟‘ndx), ∗⟩}) ∨ ∅ ∈ ({⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∪ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩})))
69		elun 4155	. . . . . . . . 9 ⊢ (∅ ∈ ({⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∪ {⟨(*𝑟‘ndx), ∗⟩}) ↔ (∅ ∈ {⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∨ ∅ ∈ {⟨(*𝑟‘ndx), ∗⟩}))
70		elun 4155	. . . . . . . . 9 ⊢ (∅ ∈ ({⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∪ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩}) ↔ (∅ ∈ {⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∨ ∅ ∈ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩}))
71	69, 70	orbi12i 928	. . . . . . . 8 ⊢ ((∅ ∈ ({⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∪ {⟨(*𝑟‘ndx), ∗⟩}) ∨ ∅ ∈ ({⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∪ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩})) ↔ ((∅ ∈ {⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∨ ∅ ∈ {⟨(*𝑟‘ndx), ∗⟩}) ∨ (∅ ∈ {⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∨ ∅ ∈ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩})))
72	67, 68, 71	3bitri 300	. . . . . . 7 ⊢ (∅ ∈ ℂfld ↔ ((∅ ∈ {⟨(Base‘ndx), ℂ⟩, ⟨(+g‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 + 𝑣))⟩, ⟨(.r‘ndx), (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))⟩} ∨ ∅ ∈ {⟨(*𝑟‘ndx), ∗⟩}) ∨ (∅ ∈ {⟨(TopSet‘ndx), (MetOpen‘(abs ∘ − ))⟩, ⟨(le‘ndx), ≤ ⟩, ⟨(dist‘ndx), (abs ∘ − )⟩} ∨ ∅ ∈ {⟨(UnifSet‘ndx), (metUnif‘(abs ∘ − ))⟩})))
73	65, 72	mtbir 326	. . . . . 6 ⊢ ¬ ∅ ∈ ℂfld
74		disjsn 4672	. . . . . 6 ⊢ ((ℂfld ∩ {∅}) = ∅ ↔ ¬ ∅ ∈ ℂfld)
75	73, 74	mpbir 234	. . . . 5 ⊢ (ℂfld ∩ {∅}) = ∅
76		disjdif2 4439	. . . . 5 ⊢ ((ℂfld ∩ {∅}) = ∅ → (ℂfld ∖ {∅}) = ℂfld)
77	75, 76	ax-mp 5	. . . 4 ⊢ (ℂfld ∖ {∅}) = ℂfld
78	77	funeqi 6580	. . 3 ⊢ (Fun (ℂfld ∖ {∅}) ↔ Fun ℂfld)
79	2, 78	sylib 221	. 2 ⊢ (ℂfld Struct ⟨1, ;13⟩ → Fun ℂfld)
80	1, 79	ax-mp 5	1 ⊢ Fun ℂfld

This proof depends on syntax axioms:  ¬ wn 3   ∧ wa 401   ∨ wo 861   ∨ w3o 1102   ∧ w3a 1103   = wceq 1570   ∈ wcel 2147   ≠ wne 2959  Vcvv 3454   ∖ cdif 4048   ∩ cin 4092   ∪ cun 4152  ∅c0 4281  {csn 4588  {ctp 4592  ⟨cop 4838   class class class wbr 5106   × cxp 5653   ∘ ccom 5659  Fun wfun 6552  ⟶wf 6554  ‘cfv 6558  (class class class)co 7443   ∈ cmpo 7445  ℂcc 11225  ℝcr 11226  1c1 11228   + caddc 11230   · cmul 11232   ≤ cle 11371   − cmin 11568  3c3 12425  ;cdc 12841  ∗ccj 15292  abscabs 15430   Struct cstr 17353  ndxcnx 17400  Basecbs 17416  +_gcplusg 17457  ._rcmulr 17458  *_𝑟cstv 17459  TopSetcts 17463  lecple 17464  distcds 17466  UnifSetcunif 17467   TosetRel ctsr 18768  MetOpencmopn 21698  metUnifcmetu 21699  ℂ_fldccnfld 21708

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-rep 5235  ax-sep 5252  ax-nul 5263  ax-pow 5331  ax-pr 5395  ax-un 7775  ax-cnex 11283  ax-resscn 11284  ax-1cn 11285  ax-icn 11286  ax-addcl 11287  ax-addrcl 11288  ax-mulcl 11289  ax-mulrcl 11290  ax-mulcom 11291  ax-addass 11292  ax-mulass 11293  ax-distr 11294  ax-i2m1 11295  ax-1ne0 11296  ax-1rid 11297  ax-rnegex 11298  ax-rrecex 11299  ax-cnre 11300  ax-pre-lttri 11301  ax-pre-lttrn 11302  ax-pre-ltadd 11303  ax-pre-mulgt0 11304  ax-pre-sup 11305

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-nel 3066  df-ral 3081  df-rex 3091  df-rmo 3369  df-reu 3370  df-rab 3417  df-v 3456  df-sbc 3743  df-csb 3852  df-ss 3901  df-pss 4017  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-tp 4593  df-op 4839  df-uni 4871  df-iun 4956  df-br 5107  df-opab 5171  df-mpt 5190  df-tr 5216  df-id 5550  df-eprel 5555  df-po 5563  df-so 5564  df-fr 5608  df-we 5610  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-res 5667  df-ima 5668  df-pred 6322  df-ord 6383  df-on 6384  df-lim 6385  df-suc 6386  df-iota 6512  df-fun 6560  df-fn 6561  df-f 6562  df-f1 6563  df-fo 6564  df-f1o 6565  df-fv 6566  df-riota 7400  df-ov 7446  df-oprab 7447  df-mpo 7448  df-om 7902  df-1st 8025  df-2nd 8026  df-frecs 8327  df-wrecs 8358  df-recs 8407  df-rdg 8446  df-1o 8504  df-er 8745  df-en 9002  df-dom 9003  df-sdom 9004  df-fin 9005  df-sup 9461  df-pnf 11372  df-mnf 11373  df-xr 11374  df-ltxr 11375  df-le 11376  df-sub 11570  df-neg 11571  df-div 12001  df-nn 12363  df-2 12432  df-3 12433  df-4 12434  df-5 12435  df-6 12436  df-7 12437  df-8 12438  df-9 12439  df-n0 12634  df-z 12721  df-dec 12842  df-uz 12993  df-rp 13148  df-fz 13667  df-seq 14172  df-exp 14232  df-cj 15295  df-re 15296  df-im 15297  df-sqrt 15431  df-abs 15432  df-struct 17354  df-slot 17389  df-ndx 17401  df-base 17417  df-plusg 17470  df-mulr 17471  df-starv 17472  df-tset 17476  df-ple 17477  df-ds 17479  df-unif 17480  df-ps 18769  df-tsr 18770  df-cnfld 21709

This theorem is used by: (None)