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Theorem bj-nnen2lp 16089
Description: A version of en2lp 4620 for natural numbers, which does not require ax-setind 4603.

Note: using this theorem and bj-nnelirr 16088, one can remove dependency on ax-setind 4603 from nntri2 6603 and nndcel 6609; one can actually remove more dependencies from these. (Contributed by BJ, 28-Nov-2019.) (Proof modification is discouraged.)

Assertion
Ref Expression
bj-nnen2lp  |-  ( ( A  e.  om  /\  B  e.  om )  ->  -.  ( A  e.  B  /\  B  e.  A ) )

Proof of Theorem bj-nnen2lp
StepHypRef Expression
1 bj-nnelirr 16088 . . 3  |-  ( B  e.  om  ->  -.  B  e.  B )
21adantl 277 . 2  |-  ( ( A  e.  om  /\  B  e.  om )  ->  -.  B  e.  B
)
3 bj-nntrans 16086 . . . . 5  |-  ( B  e.  om  ->  ( A  e.  B  ->  A 
C_  B ) )
43adantl 277 . . . 4  |-  ( ( A  e.  om  /\  B  e.  om )  ->  ( A  e.  B  ->  A  C_  B )
)
5 ssel 3195 . . . 4  |-  ( A 
C_  B  ->  ( B  e.  A  ->  B  e.  B ) )
64, 5syl6 33 . . 3  |-  ( ( A  e.  om  /\  B  e.  om )  ->  ( A  e.  B  ->  ( B  e.  A  ->  B  e.  B ) ) )
76impd 254 . 2  |-  ( ( A  e.  om  /\  B  e.  om )  ->  ( ( A  e.  B  /\  B  e.  A )  ->  B  e.  B ) )
82, 7mtod 665 1  |-  ( ( A  e.  om  /\  B  e.  om )  ->  -.  ( A  e.  B  /\  B  e.  A ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104    e. wcel 2178    C_ wss 3174   omcom 4656
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-in1 615  ax-in2 616  ax-io 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-13 2180  ax-14 2181  ax-ext 2189  ax-nul 4186  ax-pr 4269  ax-un 4498  ax-bd0 15948  ax-bdor 15951  ax-bdn 15952  ax-bdal 15953  ax-bdex 15954  ax-bdeq 15955  ax-bdel 15956  ax-bdsb 15957  ax-bdsep 16019  ax-infvn 16076
This theorem depends on definitions:  df-bi 117  df-tru 1376  df-nf 1485  df-sb 1787  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ral 2491  df-rex 2492  df-rab 2495  df-v 2778  df-dif 3176  df-un 3178  df-in 3180  df-ss 3187  df-nul 3469  df-sn 3649  df-pr 3650  df-uni 3865  df-int 3900  df-suc 4436  df-iom 4657  df-bdc 15976  df-bj-ind 16062
This theorem is referenced by:  bj-peano4  16090
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