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Theorem bj-nnen2lp 17151
Description: A version of en2lp 4701 for natural numbers, which does not require ax-setind 4684.

Note: using this theorem and bj-nnelirr 17150, one can remove dependency on ax-setind 4684 from nntri2 6767 and nndcel 6773; one can actually remove more dependencies from these. (Contributed by BJ, 28-Nov-2019.) (Proof modification is discouraged.)

Assertion
Ref Expression
bj-nnen2lp ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → ¬ (𝐴 ∈ 𝐵 ∧ 𝐵 ∈ 𝐴))

Proof of Theorem bj-nnen2lp
StepHypRef Expression
1 bj-nnelirr 17150 . . 3 (𝐵 ∈ ω → ¬ 𝐵 ∈ 𝐵)
21adantl 277 . 2 ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → ¬ 𝐵 ∈ 𝐵)
3 bj-nntrans 17148 . . . . 5 (𝐵 ∈ ω → (𝐴 ∈ 𝐵 → 𝐴 ⊆ 𝐵))
43adantl 277 . . . 4 ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → (𝐴 ∈ 𝐵 → 𝐴 ⊆ 𝐵))
5 ssel 3242 . . . 4 (𝐴 ⊆ 𝐵 → (𝐵 ∈ 𝐴 → 𝐵 ∈ 𝐵))
64, 5syl6 33 . . 3 ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → (𝐴 ∈ 𝐵 → (𝐵 ∈ 𝐴 → 𝐵 ∈ 𝐵)))
76impd 254 . 2 ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → ((𝐴 ∈ 𝐵 ∧ 𝐵 ∈ 𝐴) → 𝐵 ∈ 𝐵))
82, 7mtod 673 1 ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → ¬ (𝐴 ∈ 𝐵 ∧ 𝐵 ∈ 𝐴))
Colors of variables:    wff set class
This proof depends on syntax axioms:  ¬ wn 3   → wi 4   ∧ wa 104   ∈ wcel 2209   ⊆ wss 3220  ωcom 4737
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-13 2211  ax-14 2212  ax-ext 2220  ax-nul 4259  ax-pr 4346  ax-un 4578  ax-bd0 17010  ax-bdor 17013  ax-bdn 17014  ax-bdal 17015  ax-bdex 17016  ax-bdeq 17017  ax-bdel 17018  ax-bdsb 17019  ax-bdsep 17081  ax-infvn 17138
This proof depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-sn 3715  df-pr 3716  df-uni 3936  df-int 3971  df-suc 4516  df-iom 4738  df-bdc 17038  df-bj-ind 17124
This theorem is used by:  bj-peano4  17152
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