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Theorem reg3exmidlemwe 4461
Description: Lemma for reg3exmid 4462. Our counterexample 𝐴 satisfies We. (Contributed by Jim Kingdon, 3-Oct-2021.)
Hypothesis
Ref Expression
reg3exmidlemwe.a 𝐴 = {𝑥 ∈ {∅, {∅}} ∣ (𝑥 = {∅} ∨ (𝑥 = ∅ ∧ 𝜑))}
Assertion
Ref Expression
reg3exmidlemwe E We 𝐴
Distinct variable group:   𝜑,𝑥
Allowed substitution hint:   𝐴(𝑥)

Proof of Theorem reg3exmidlemwe
Dummy variables 𝑎 𝑏 𝑐 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 zfregfr 4456 . 2 E Fr 𝐴
2 epel 4182 . . . . . 6 (𝑎 E 𝑏𝑎𝑏)
3 epel 4182 . . . . . 6 (𝑏 E 𝑐𝑏𝑐)
42, 3anbi12i 453 . . . . 5 ((𝑎 E 𝑏𝑏 E 𝑐) ↔ (𝑎𝑏𝑏𝑐))
5 simpr 109 . . . . . 6 (((𝑎𝐴𝑏𝐴𝑐𝐴) ∧ (𝑎𝑏𝑏𝑐)) → (𝑎𝑏𝑏𝑐))
6 elirr 4424 . . . . . . . 8 ¬ {∅} ∈ {∅}
7 simprr 504 . . . . . . . . . 10 (((𝑎𝐴𝑏𝐴𝑐𝐴) ∧ (𝑎𝑏𝑏𝑐)) → 𝑏𝑐)
8 noel 3335 . . . . . . . . . . . . 13 ¬ 𝑎 ∈ ∅
9 eleq2 2179 . . . . . . . . . . . . 13 (𝑏 = ∅ → (𝑎𝑏𝑎 ∈ ∅))
108, 9mtbiri 647 . . . . . . . . . . . 12 (𝑏 = ∅ → ¬ 𝑎𝑏)
11 simprl 503 . . . . . . . . . . . 12 (((𝑎𝐴𝑏𝐴𝑐𝐴) ∧ (𝑎𝑏𝑏𝑐)) → 𝑎𝑏)
1210, 11nsyl3 598 . . . . . . . . . . 11 (((𝑎𝐴𝑏𝐴𝑐𝐴) ∧ (𝑎𝑏𝑏𝑐)) → ¬ 𝑏 = ∅)
13 elrabi 2808 . . . . . . . . . . . . . . . 16 (𝑏 ∈ {𝑥 ∈ {∅, {∅}} ∣ (𝑥 = {∅} ∨ (𝑥 = ∅ ∧ 𝜑))} → 𝑏 ∈ {∅, {∅}})
14 reg3exmidlemwe.a . . . . . . . . . . . . . . . 16 𝐴 = {𝑥 ∈ {∅, {∅}} ∣ (𝑥 = {∅} ∨ (𝑥 = ∅ ∧ 𝜑))}
1513, 14eleq2s 2210 . . . . . . . . . . . . . . 15 (𝑏𝐴𝑏 ∈ {∅, {∅}})
16 elpri 3518 . . . . . . . . . . . . . . 15 (𝑏 ∈ {∅, {∅}} → (𝑏 = ∅ ∨ 𝑏 = {∅}))
1715, 16syl 14 . . . . . . . . . . . . . 14 (𝑏𝐴 → (𝑏 = ∅ ∨ 𝑏 = {∅}))
1817orcomd 701 . . . . . . . . . . . . 13 (𝑏𝐴 → (𝑏 = {∅} ∨ 𝑏 = ∅))
19183ad2ant2 986 . . . . . . . . . . . 12 ((𝑎𝐴𝑏𝐴𝑐𝐴) → (𝑏 = {∅} ∨ 𝑏 = ∅))
2019adantr 272 . . . . . . . . . . 11 (((𝑎𝐴𝑏𝐴𝑐𝐴) ∧ (𝑎𝑏𝑏𝑐)) → (𝑏 = {∅} ∨ 𝑏 = ∅))
2112, 20ecased 1310 . . . . . . . . . 10 (((𝑎𝐴𝑏𝐴𝑐𝐴) ∧ (𝑎𝑏𝑏𝑐)) → 𝑏 = {∅})
22 noel 3335 . . . . . . . . . . . . 13 ¬ 𝑏 ∈ ∅
23 eleq2 2179 . . . . . . . . . . . . 13 (𝑐 = ∅ → (𝑏𝑐𝑏 ∈ ∅))
2422, 23mtbiri 647 . . . . . . . . . . . 12 (𝑐 = ∅ → ¬ 𝑏𝑐)
2524, 7nsyl3 598 . . . . . . . . . . 11 (((𝑎𝐴𝑏𝐴𝑐𝐴) ∧ (𝑎𝑏𝑏𝑐)) → ¬ 𝑐 = ∅)
26 elrabi 2808 . . . . . . . . . . . . . . . 16 (𝑐 ∈ {𝑥 ∈ {∅, {∅}} ∣ (𝑥 = {∅} ∨ (𝑥 = ∅ ∧ 𝜑))} → 𝑐 ∈ {∅, {∅}})
2726, 14eleq2s 2210 . . . . . . . . . . . . . . 15 (𝑐𝐴𝑐 ∈ {∅, {∅}})
28 vex 2661 . . . . . . . . . . . . . . . 16 𝑐 ∈ V
2928elpr 3516 . . . . . . . . . . . . . . 15 (𝑐 ∈ {∅, {∅}} ↔ (𝑐 = ∅ ∨ 𝑐 = {∅}))
3027, 29sylib 121 . . . . . . . . . . . . . 14 (𝑐𝐴 → (𝑐 = ∅ ∨ 𝑐 = {∅}))
3130orcomd 701 . . . . . . . . . . . . 13 (𝑐𝐴 → (𝑐 = {∅} ∨ 𝑐 = ∅))
32313ad2ant3 987 . . . . . . . . . . . 12 ((𝑎𝐴𝑏𝐴𝑐𝐴) → (𝑐 = {∅} ∨ 𝑐 = ∅))
3332adantr 272 . . . . . . . . . . 11 (((𝑎𝐴𝑏𝐴𝑐𝐴) ∧ (𝑎𝑏𝑏𝑐)) → (𝑐 = {∅} ∨ 𝑐 = ∅))
3425, 33ecased 1310 . . . . . . . . . 10 (((𝑎𝐴𝑏𝐴𝑐𝐴) ∧ (𝑎𝑏𝑏𝑐)) → 𝑐 = {∅})
357, 21, 343eltr3d 2198 . . . . . . . . 9 (((𝑎𝐴𝑏𝐴𝑐𝐴) ∧ (𝑎𝑏𝑏𝑐)) → {∅} ∈ {∅})
3635ex 114 . . . . . . . 8 ((𝑎𝐴𝑏𝐴𝑐𝐴) → ((𝑎𝑏𝑏𝑐) → {∅} ∈ {∅}))
376, 36mtoi 636 . . . . . . 7 ((𝑎𝐴𝑏𝐴𝑐𝐴) → ¬ (𝑎𝑏𝑏𝑐))
3837adantr 272 . . . . . 6 (((𝑎𝐴𝑏𝐴𝑐𝐴) ∧ (𝑎𝑏𝑏𝑐)) → ¬ (𝑎𝑏𝑏𝑐))
395, 38pm2.21dd 592 . . . . 5 (((𝑎𝐴𝑏𝐴𝑐𝐴) ∧ (𝑎𝑏𝑏𝑐)) → 𝑎 E 𝑐)
404, 39sylan2b 283 . . . 4 (((𝑎𝐴𝑏𝐴𝑐𝐴) ∧ (𝑎 E 𝑏𝑏 E 𝑐)) → 𝑎 E 𝑐)
4140ex 114 . . 3 ((𝑎𝐴𝑏𝐴𝑐𝐴) → ((𝑎 E 𝑏𝑏 E 𝑐) → 𝑎 E 𝑐))
4241rgen3 2494 . 2 𝑎𝐴𝑏𝐴𝑐𝐴 ((𝑎 E 𝑏𝑏 E 𝑐) → 𝑎 E 𝑐)
43 df-wetr 4224 . 2 ( E We 𝐴 ↔ ( E Fr 𝐴 ∧ ∀𝑎𝐴𝑏𝐴𝑐𝐴 ((𝑎 E 𝑏𝑏 E 𝑐) → 𝑎 E 𝑐)))
441, 42, 43mpbir2an 909 1 E We 𝐴
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4  wa 103  wo 680  w3a 945   = wceq 1314  wcel 1463  wral 2391  {crab 2395  c0 3331  {csn 3495  {cpr 3496   class class class wbr 3897   E cep 4177   Fr wfr 4218   We wwe 4220
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 586  ax-in2 587  ax-io 681  ax-5 1406  ax-7 1407  ax-gen 1408  ax-ie1 1452  ax-ie2 1453  ax-8 1465  ax-10 1466  ax-11 1467  ax-i12 1468  ax-bndl 1469  ax-4 1470  ax-14 1475  ax-17 1489  ax-i9 1493  ax-ial 1497  ax-i5r 1498  ax-ext 2097  ax-sep 4014  ax-pow 4066  ax-pr 4099  ax-setind 4420
This theorem depends on definitions:  df-bi 116  df-3an 947  df-tru 1317  df-nf 1420  df-sb 1719  df-eu 1978  df-mo 1979  df-clab 2102  df-cleq 2108  df-clel 2111  df-nfc 2245  df-ne 2284  df-ral 2396  df-rab 2400  df-v 2660  df-dif 3041  df-un 3043  df-in 3045  df-ss 3052  df-nul 3332  df-pw 3480  df-sn 3501  df-pr 3502  df-op 3504  df-br 3898  df-opab 3958  df-eprel 4179  df-frfor 4221  df-frind 4222  df-wetr 4224
This theorem is referenced by:  reg3exmid  4462
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