Theorem acexmidlema 5844

Description: Lemma for acexmid 5852. (Contributed by Jim Kingdon, 6-Aug-2019.)

Hypotheses

Ref	Expression
acexmidlem.a	⊢ 𝐴 = {𝑥 ∈ {∅, {∅}} ∣ (𝑥 = ∅ ∨ 𝜑)}
acexmidlem.b	⊢ 𝐵 = {𝑥 ∈ {∅, {∅}} ∣ (𝑥 = {∅} ∨ 𝜑)}
acexmidlem.c	⊢ 𝐶 = {𝐴, 𝐵}

Assertion

Ref	Expression
acexmidlema	⊢ ({∅} ∈ 𝐴 → 𝜑)

Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑥,𝐶   𝜑,𝑥

Proof of Theorem acexmidlema

Step	Hyp	Ref	Expression
1		acexmidlem.a	. . . 4 ⊢ 𝐴 = {𝑥 ∈ {∅, {∅}} ∣ (𝑥 = ∅ ∨ 𝜑)}
2	1	eleq2i 2237	. . 3 ⊢ ({∅} ∈ 𝐴 ↔ {∅} ∈ {𝑥 ∈ {∅, {∅}} ∣ (𝑥 = ∅ ∨ 𝜑)})
3		p0ex 4174	. . . . 5 ⊢ {∅} ∈ V
4	3	prid2 3690	. . . 4 ⊢ {∅} ∈ {∅, {∅}}
5		eqeq1 2177	. . . . . 6 ⊢ (𝑥 = {∅} → (𝑥 = ∅ ↔ {∅} = ∅))
6	5	orbi1d 786	. . . . 5 ⊢ (𝑥 = {∅} → ((𝑥 = ∅ ∨ 𝜑) ↔ ({∅} = ∅ ∨ 𝜑)))
7	6	elrab3 2887	. . . 4 ⊢ ({∅} ∈ {∅, {∅}} → ({∅} ∈ {𝑥 ∈ {∅, {∅}} ∣ (𝑥 = ∅ ∨ 𝜑)} ↔ ({∅} = ∅ ∨ 𝜑)))
8	4, 7	ax-mp 5	. . 3 ⊢ ({∅} ∈ {𝑥 ∈ {∅, {∅}} ∣ (𝑥 = ∅ ∨ 𝜑)} ↔ ({∅} = ∅ ∨ 𝜑))
9	2, 8	bitri 183	. 2 ⊢ ({∅} ∈ 𝐴 ↔ ({∅} = ∅ ∨ 𝜑))
10		noel 3418	. . . 4 ⊢ ¬ ∅ ∈ ∅
11		0ex 4116	. . . . . 6 ⊢ ∅ ∈ V
12	11	snid 3614	. . . . 5 ⊢ ∅ ∈ {∅}
13		eleq2 2234	. . . . 5 ⊢ ({∅} = ∅ → (∅ ∈ {∅} ↔ ∅ ∈ ∅))
14	12, 13	mpbii 147	. . . 4 ⊢ ({∅} = ∅ → ∅ ∈ ∅)
15	10, 14	mto 657	. . 3 ⊢ ¬ {∅} = ∅
16		orel1 720	. . 3 ⊢ (¬ {∅} = ∅ → (({∅} = ∅ ∨ 𝜑) → 𝜑))
17	15, 16	ax-mp 5	. 2 ⊢ (({∅} = ∅ ∨ 𝜑) → 𝜑)
18	9, 17	sylbi 120	1 ⊢ ({∅} ∈ 𝐴 → 𝜑)

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 104   ∨ wo 703   = wceq 1348   ∈ wcel 2141  {crab 2452  ∅c0 3414  {csn 3583  {cpr 3584

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-14 2144  ax-ext 2152  ax-sep 4107  ax-nul 4115  ax-pow 4160

This theorem depends on definitions:  df-bi 116  df-tru 1351  df-nf 1454  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-rab 2457  df-v 2732  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-nul 3415  df-pw 3568  df-sn 3589  df-pr 3590

This theorem is referenced by:  acexmidlem1  5849