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Theorem brsdom 8977
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 8952 . . 3 ≺ = ( ≼ ∖ ≈ )
21eleq2i 2857 . 2 (⟨𝐴, 𝐵⟩ ∈ ≺ ↔ ⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ))
3 df-br 5112 . 2 (𝐴𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≺ )
4 df-br 5112 . . . 4 (𝐴𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≼ )
5 df-br 5112 . . . . 5 (𝐴𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≈ )
65notbii 323 . . . 4 𝐴𝐵 ↔ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ )
74, 6anbi12i 640 . . 3 ((𝐴𝐵 ∧ ¬ 𝐴𝐵) ↔ (⟨𝐴, 𝐵⟩ ∈ ≼ ∧ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ ))
8 eldif 3916 . . 3 (⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ) ↔ (⟨𝐴, 𝐵⟩ ∈ ≼ ∧ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ ))
97, 8bitr4i 281 . 2 ((𝐴𝐵 ∧ ¬ 𝐴𝐵) ↔ ⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ))
102, 3, 93bitr4i 306 1 (𝐴𝐵 ↔ (𝐴𝐵 ∧ ¬ 𝐴𝐵))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ¬ wn 3  wb 209  wa 401  wcel 2146  cdif 3903  cop 4597   class class class wbr 5111  cen 8946  cdom 8947  csdm 8948
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-ext 2737
This proof depends on definitions:  df-bi 210  df-an 402  df-tru 1573  df-ex 1813  df-sb 2100  df-clab 2744  df-cleq 2757  df-clel 2840  df-v 3459  df-dif 3909  df-br 5112  df-sdom 8952
This theorem is used by:  sdomdom  8983  sdomnen  8984  0sdomg  9101  sdom0  9104  sdomdomtr  9105  domsdomtr  9107  domtriord  9118  canth2  9125  sdomdomtrfi  9192  domsdomtrfi  9193  php2  9199  nnsdomo  9210  1sdom2  9215  sdom1  9217  1sdom2dom  9221  nnsdomg  9266  card2inf  9524  cardsdomelir  9975  cardsdom2  9990  fidomtri2  9996  cardmin2  10001  alephordi  10074  alephord  10075  isfin4p1  10314  isfin5-2  10390  canthnum  10651  canthwe  10653  canthp1  10656  gchdjuidm  10670  gchxpidm  10671  gchhar  10681  axgroth6  10830  hashsdom  14437  ruc  16323  iscard5  44322
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