Theorem 1strbas 13205

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 13145	. 2 ⊢ (Base = Slot (Base‘ndx) ∧ (Base‘ndx) ∈ ℕ)
2		1str.g	. . 3 ⊢ 𝐺 = {⟨(Base‘ndx), 𝐵⟩}
3		basendxnn 13143	. . . . 5 ⊢ (Base‘ndx) ∈ ℕ
4		opexg 4320	. . . . 5 ⊢ (((Base‘ndx) ∈ ℕ ∧ 𝐵 ∈ 𝑉) → ⟨(Base‘ndx), 𝐵⟩ ∈ V)
5	3, 4	mpan 424	. . . 4 ⊢ (𝐵 ∈ 𝑉 → ⟨(Base‘ndx), 𝐵⟩ ∈ V)
6		snexg 4274	. . . 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 5376	. . . 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 5347	. . 3 ⊢ (Fun 𝐺 ↔ Fun {⟨(Base‘ndx), 𝐵⟩})
12	10, 11	sylibr 134	. 2 ⊢ (𝐵 ∈ 𝑉 → Fun 𝐺)
13		snidg 3698	. . . 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 13129	1 ⊢ (𝐵 ∈ 𝑉 → 𝐵 = (Base‘𝐺))

Syntax hints:   → wi 4   = wceq 1397   ∈ wcel 2202  Vcvv 2802  {csn 3669  ⟨cop 3672  Fun wfun 5320  ‘cfv 5326  ℕcn 9143  ndxcnx 13084  Basecbs 13087

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-cnex 8123  ax-resscn 8124  ax-1re 8126  ax-addrcl 8129

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-v 2804  df-sbc 3032  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-iota 5286  df-fun 5328  df-fv 5334  df-inn 9144  df-ndx 13090  df-slot 13091  df-base 13093

This theorem is referenced by: (None)