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Theorem sdomnsym 8085
Description: Strict dominance is asymmetric. Theorem 21(ii) of [Suppes] p. 97. (Contributed by NM, 8-Jun-1998.)
Assertion
Ref Expression
sdomnsym (𝐴𝐵 → ¬ 𝐵𝐴)

Proof of Theorem sdomnsym
StepHypRef Expression
1 sdomnen 7984 . 2 (𝐴𝐵 → ¬ 𝐴𝐵)
2 sdomdom 7983 . . 3 (𝐴𝐵𝐴𝐵)
3 sdomdom 7983 . . 3 (𝐵𝐴𝐵𝐴)
4 sbth 8080 . . 3 ((𝐴𝐵𝐵𝐴) → 𝐴𝐵)
52, 3, 4syl2an 494 . 2 ((𝐴𝐵𝐵𝐴) → 𝐴𝐵)
61, 5mtand 691 1 (𝐴𝐵 → ¬ 𝐵𝐴)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4   class class class wbr 4653  cen 7952  cdom 7953  csdm 7954
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-en 7956  df-dom 7957  df-sdom 7958
This theorem is referenced by:  domnsym  8086  gchpwdom  9492
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