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Theorem bj-nnen2lp 13989
Description: A version of en2lp 4538 for natural numbers, which does not require ax-setind 4521.

Note: using this theorem and bj-nnelirr 13988, one can remove dependency on ax-setind 4521 from nntri2 6473 and nndcel 6479; 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) → ¬ (𝐴𝐵𝐵𝐴))

Proof of Theorem bj-nnen2lp
StepHypRef Expression
1 bj-nnelirr 13988 . . 3 (𝐵 ∈ ω → ¬ 𝐵𝐵)
21adantl 275 . 2 ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → ¬ 𝐵𝐵)
3 bj-nntrans 13986 . . . . 5 (𝐵 ∈ ω → (𝐴𝐵𝐴𝐵))
43adantl 275 . . . 4 ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → (𝐴𝐵𝐴𝐵))
5 ssel 3141 . . . 4 (𝐴𝐵 → (𝐵𝐴𝐵𝐵))
64, 5syl6 33 . . 3 ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → (𝐴𝐵 → (𝐵𝐴𝐵𝐵)))
76impd 252 . 2 ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → ((𝐴𝐵𝐵𝐴) → 𝐵𝐵))
82, 7mtod 658 1 ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → ¬ (𝐴𝐵𝐵𝐴))
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4  wa 103  wcel 2141  wss 3121  ωcom 4574
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-13 2143  ax-14 2144  ax-ext 2152  ax-nul 4115  ax-pr 4194  ax-un 4418  ax-bd0 13848  ax-bdor 13851  ax-bdn 13852  ax-bdal 13853  ax-bdex 13854  ax-bdeq 13855  ax-bdel 13856  ax-bdsb 13857  ax-bdsep 13919  ax-infvn 13976
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-ral 2453  df-rex 2454  df-rab 2457  df-v 2732  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-nul 3415  df-sn 3589  df-pr 3590  df-uni 3797  df-int 3832  df-suc 4356  df-iom 4575  df-bdc 13876  df-bj-ind 13962
This theorem is referenced by:  bj-peano4  13990
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