Theorem 1strbas 13261

Description: The base set of a constructed one-slot structure. (Contributed by AV, 27-Mar-2020.)

Hypothesis

Ref	Expression
1str.g	⊢ 𝐺 = {⟨(Base‘ndx), 𝐵⟩}

Assertion

Ref	Expression
1strbas	⊢ (𝐵 ∈ 𝑉 → 𝐵 = (Base‘𝐺))

Proof of Theorem 1strbas

Step	Hyp	Ref	Expression
1		baseslid 13201	. 2 ⊢ (Base = Slot (Base‘ndx) ∧ (Base‘ndx) ∈ ℕ)
2		1str.g	. . 3 ⊢ 𝐺 = {⟨(Base‘ndx), 𝐵⟩}
3		basendxnn 13199	. . . . 5 ⊢ (Base‘ndx) ∈ ℕ
4		opexg 4326	. . . . 5 ⊢ (((Base‘ndx) ∈ ℕ ∧ 𝐵 ∈ 𝑉) → ⟨(Base‘ndx), 𝐵⟩ ∈ V)
5	3, 4	mpan 424	. . . 4 ⊢ (𝐵 ∈ 𝑉 → ⟨(Base‘ndx), 𝐵⟩ ∈ V)
6		snexg 4280	. . . 4 ⊢ (⟨(Base‘ndx), 𝐵⟩ ∈ V → {⟨(Base‘ndx), 𝐵⟩} ∈ V)
7	5, 6	syl 14	. . 3 ⊢ (𝐵 ∈ 𝑉 → {⟨(Base‘ndx), 𝐵⟩} ∈ V)
8	2, 7	eqeltrid 2318	. 2 ⊢ (𝐵 ∈ 𝑉 → 𝐺 ∈ V)
9		funsng 5383	. . . 4 ⊢ (((Base‘ndx) ∈ ℕ ∧ 𝐵 ∈ 𝑉) → Fun {⟨(Base‘ndx), 𝐵⟩})
10	3, 9	mpan 424	. . 3 ⊢ (𝐵 ∈ 𝑉 → Fun {⟨(Base‘ndx), 𝐵⟩})
11	2	funeqi 5354	. . 3 ⊢ (Fun 𝐺 ↔ Fun {⟨(Base‘ndx), 𝐵⟩})
12	10, 11	sylibr 134	. 2 ⊢ (𝐵 ∈ 𝑉 → Fun 𝐺)
13		snidg 3702	. . . 4 ⊢ (⟨(Base‘ndx), 𝐵⟩ ∈ V → ⟨(Base‘ndx), 𝐵⟩ ∈ {⟨(Base‘ndx), 𝐵⟩})
14	5, 13	syl 14	. . 3 ⊢ (𝐵 ∈ 𝑉 → ⟨(Base‘ndx), 𝐵⟩ ∈ {⟨(Base‘ndx), 𝐵⟩})
15	14, 2	eleqtrrdi 2325	. 2 ⊢ (𝐵 ∈ 𝑉 → ⟨(Base‘ndx), 𝐵⟩ ∈ 𝐺)
16	1, 8, 12, 15	strslfvd 13185	1 ⊢ (𝐵 ∈ 𝑉 → 𝐵 = (Base‘𝐺))

Syntax hints:   → wi 4   = wceq 1398   ∈ wcel 2202  Vcvv 2803  {csn 3673  ⟨cop 3676  Fun wfun 5327  ‘cfv 5333  ℕcn 9186  ndxcnx 13140  Basecbs 13143

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-pr 4305  ax-un 4536  ax-cnex 8166  ax-resscn 8167  ax-1re 8169  ax-addrcl 8172

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ral 2516  df-rex 2517  df-v 2805  df-sbc 3033  df-un 3205  df-in 3207  df-ss 3214  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-int 3934  df-br 4094  df-opab 4156  df-mpt 4157  df-id 4396  df-xp 4737  df-rel 4738  df-cnv 4739  df-co 4740  df-dm 4741  df-rn 4742  df-res 4743  df-iota 5293  df-fun 5335  df-fv 5341  df-inn 9187  df-ndx 13146  df-slot 13147  df-base 13149

This theorem is referenced by: (None)