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Theorem brsdom 8987
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 8960 . . 3 ≺ = ( ≼ ∖ ≈ )
21eleq2i 2826 . 2 (⟨𝐴, 𝐵⟩ ∈ ≺ ↔ ⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ))
3 df-br 5120 . 2 (𝐴𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≺ )
4 df-br 5120 . . . 4 (𝐴𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≼ )
5 df-br 5120 . . . . 5 (𝐴𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≈ )
65notbii 320 . . . 4 𝐴𝐵 ↔ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ )
74, 6anbi12i 628 . . 3 ((𝐴𝐵 ∧ ¬ 𝐴𝐵) ↔ (⟨𝐴, 𝐵⟩ ∈ ≼ ∧ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ ))
8 eldif 3936 . . 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 3923  cop 4607   class class class wbr 5119  cen 8954  cdom 8955  csdm 8956
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 2707
This theorem depends on definitions:  df-bi 207  df-an 396  df-tru 1543  df-ex 1780  df-sb 2065  df-clab 2714  df-cleq 2727  df-clel 2809  df-v 3461  df-dif 3929  df-br 5120  df-sdom 8960
This theorem is referenced by:  sdomdom  8992  sdomnen  8993  0sdomg  9116  0sdomgOLD  9117  sdom0  9120  sdomdomtr  9122  domsdomtr  9124  domtriord  9135  canth2  9142  sdomdomtrfi  9213  domsdomtrfi  9214  php2  9220  php2OLD  9230  php3OLD  9231  nnsdomo  9240  1sdom2  9246  sdom1  9248  1sdom2dom  9253  nnsdomg  9305  nnsdomgOLD  9306  card2inf  9567  cardsdomelir  9985  cardsdom2  10000  fidomtri2  10006  cardmin2  10011  alephordi  10086  alephord  10087  isfin4p1  10327  isfin5-2  10403  canthnum  10661  canthwe  10663  canthp1  10666  gchdjuidm  10680  gchxpidm  10681  gchhar  10691  axgroth6  10840  hashsdom  14397  ruc  16259  iscard5  43507
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