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Theorem nlt1pig 7560
Description: No positive integer is less than one. (Contributed by Jim Kingdon, 31-Aug-2019.)
Assertion
Ref Expression
nlt1pig  |-  ( A  e.  N.  ->  -.  A  <N  1o )

Proof of Theorem nlt1pig
StepHypRef Expression
1 elni 7527 . . 3  |-  ( A  e.  N.  <->  ( A  e.  om  /\  A  =/=  (/) ) )
21simprbi 275 . 2  |-  ( A  e.  N.  ->  A  =/=  (/) )
3 noel 3498 . . . . 5  |-  -.  A  e.  (/)
4 1pi 7534 . . . . . . . . 9  |-  1o  e.  N.
5 ltpiord 7538 . . . . . . . . 9  |-  ( ( A  e.  N.  /\  1o  e.  N. )  -> 
( A  <N  1o  <->  A  e.  1o ) )
64, 5mpan2 425 . . . . . . . 8  |-  ( A  e.  N.  ->  ( A  <N  1o  <->  A  e.  1o ) )
7 df-1o 6581 . . . . . . . . . 10  |-  1o  =  suc  (/)
87eleq2i 2298 . . . . . . . . 9  |-  ( A  e.  1o  <->  A  e.  suc  (/) )
9 elsucg 4501 . . . . . . . . 9  |-  ( A  e.  N.  ->  ( A  e.  suc  (/)  <->  ( A  e.  (/)  \/  A  =  (/) ) ) )
108, 9bitrid 192 . . . . . . . 8  |-  ( A  e.  N.  ->  ( A  e.  1o  <->  ( A  e.  (/)  \/  A  =  (/) ) ) )
116, 10bitrd 188 . . . . . . 7  |-  ( A  e.  N.  ->  ( A  <N  1o  <->  ( A  e.  (/)  \/  A  =  (/) ) ) )
1211biimpa 296 . . . . . 6  |-  ( ( A  e.  N.  /\  A  <N  1o )  -> 
( A  e.  (/)  \/  A  =  (/) ) )
1312ord 731 . . . . 5  |-  ( ( A  e.  N.  /\  A  <N  1o )  -> 
( -.  A  e.  (/)  ->  A  =  (/) ) )
143, 13mpi 15 . . . 4  |-  ( ( A  e.  N.  /\  A  <N  1o )  ->  A  =  (/) )
1514ex 115 . . 3  |-  ( A  e.  N.  ->  ( A  <N  1o  ->  A  =  (/) ) )
1615necon3ad 2444 . 2  |-  ( A  e.  N.  ->  ( A  =/=  (/)  ->  -.  A  <N  1o ) )
172, 16mpd 13 1  |-  ( A  e.  N.  ->  -.  A  <N  1o )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104    <-> wb 105    \/ wo 715    = wceq 1397    e. wcel 2202    =/= wne 2402   (/)c0 3494   class class class wbr 4088   suc csuc 4462   omcom 4688   1oc1o 6574   N.cnpi 7491    <N clti 7494
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 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-nul 4215  ax-pow 4264  ax-pr 4299  ax-un 4530
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-ral 2515  df-rex 2516  df-v 2804  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-br 4089  df-opab 4151  df-eprel 4386  df-suc 4468  df-iom 4689  df-xp 4731  df-1o 6581  df-ni 7523  df-lti 7526
This theorem is referenced by:  caucvgsr  8021
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