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Theorem brsdom 9015
Description: Strict dominance relation, meaning "𝐵 is strictly greater in size than 𝐴". Definition of [Mendelson] p. 255. (Contributed by NM, 25-Jun-1998.)
Assertion
Ref Expression
brsdom (𝐴𝐵 ↔ (𝐴𝐵 ∧ ¬ 𝐴𝐵))

Proof of Theorem brsdom
StepHypRef Expression
1 df-sdom 8988 . . 3 ≺ = ( ≼ ∖ ≈ )
21eleq2i 2833 . 2 (⟨𝐴, 𝐵⟩ ∈ ≺ ↔ ⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ))
3 df-br 5144 . 2 (𝐴𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≺ )
4 df-br 5144 . . . 4 (𝐴𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≼ )
5 df-br 5144 . . . . 5 (𝐴𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≈ )
65notbii 320 . . . 4 𝐴𝐵 ↔ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ )
74, 6anbi12i 628 . . 3 ((𝐴𝐵 ∧ ¬ 𝐴𝐵) ↔ (⟨𝐴, 𝐵⟩ ∈ ≼ ∧ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ ))
8 eldif 3961 . . 3 (⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ) ↔ (⟨𝐴, 𝐵⟩ ∈ ≼ ∧ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ ))
97, 8bitr4i 278 . 2 ((𝐴𝐵 ∧ ¬ 𝐴𝐵) ↔ ⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ))
102, 3, 93bitr4i 303 1 (𝐴𝐵 ↔ (𝐴𝐵 ∧ ¬ 𝐴𝐵))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wb 206  wa 395  wcel 2108  cdif 3948  cop 4632   class class class wbr 5143  cen 8982  cdom 8983  csdm 8984
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-ext 2708
This theorem depends on definitions:  df-bi 207  df-an 396  df-tru 1543  df-ex 1780  df-sb 2065  df-clab 2715  df-cleq 2729  df-clel 2816  df-v 3482  df-dif 3954  df-br 5144  df-sdom 8988
This theorem is referenced by:  sdomdom  9020  sdomnen  9021  0sdomg  9144  0sdomgOLD  9145  sdom0  9148  sdomdomtr  9150  domsdomtr  9152  domtriord  9163  canth2  9170  sdomdomtrfi  9241  domsdomtrfi  9242  php2  9248  php2OLD  9260  php3OLD  9261  nnsdomo  9270  1sdom2  9276  sdom1  9278  1sdom2dom  9283  nnsdomg  9335  nnsdomgOLD  9336  card2inf  9595  cardsdomelir  10013  cardsdom2  10028  fidomtri2  10034  cardmin2  10039  alephordi  10114  alephord  10115  isfin4p1  10355  isfin5-2  10431  canthnum  10689  canthwe  10691  canthp1  10694  gchdjuidm  10708  gchxpidm  10709  gchhar  10719  axgroth6  10868  hashsdom  14420  ruc  16279  iscard5  43549
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