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Theorem brsdom 9039
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 (𝐴 ≺ 𝐵 ↔ (𝐴 ≼ 𝐵 ∧ ¬ 𝐴 ≈ 𝐵))

Proof of Theorem brsdom
StepHypRef Expression
1 df-sdom 9014 . . 3 ≺ = ( ≼ ∖ ≈ )
21eleq2i 2856 . 2 (⟨𝐴, 𝐵⟩ ∈ ≺ ↔ ⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ))
3 df-br 5109 . 2 (𝐴 ≺ 𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≺ )
4 df-br 5109 . . . 4 (𝐴 ≼ 𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≼ )
5 df-br 5109 . . . . 5 (𝐴 ≈ 𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≈ )
65notbii 323 . . . 4 (¬ 𝐴 ≈ 𝐵 ↔ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ )
74, 6anbi12i 640 . . 3 ((𝐴 ≼ 𝐵 ∧ ¬ 𝐴 ≈ 𝐵) ↔ (⟨𝐴, 𝐵⟩ ∈ ≼ ∧ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ ))
8 eldif 4052 . . 3 (⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ) ↔ (⟨𝐴, 𝐵⟩ ∈ ≼ ∧ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ ))
97, 8bitr4i 281 . 2 ((𝐴 ≼ 𝐵 ∧ ¬ 𝐴 ≈ 𝐵) ↔ ⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ))
102, 3, 93bitr4i 306 1 (𝐴 ≺ 𝐵 ↔ (𝐴 ≼ 𝐵 ∧ ¬ 𝐴 ≈ 𝐵))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ¬ wn 3   ↔ wb 209   ∧ wa 401   ∈ wcel 2147   ∖ cdif 4048  ⟨cop 4840   class class class wbr 5108   ≈ cen 9008   ≼ cdom 9009   ≺ csdm 9010
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 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-ext 2735
This proof depends on definitions:  df-bi 210  df-an 402  df-tru 1573  df-ex 1813  df-sb 2102  df-clab 2742  df-cleq 2755  df-clel 2839  df-v 3456  df-dif 4050  df-br 5109  df-sdom 9014
This theorem is used by:  sdomdom  9045  sdomnen  9046  0sdomg  9163  sdom0  9166  sdomdomtr  9167  domsdomtr  9169  domtriord  9180  canth2  9187  sdomdomtrfi  9254  domsdomtrfi  9255  php2  9261  nnsdomo  9272  1sdom2  9277  sdom1  9279  1sdom2dom  9283  nnsdomg  9329  card2inf  9586  cardsdomelir  10091  cardsdom2  10108  fidomtri2  10114  cardmin2  10119  alephordi  10192  alephord  10193  isfin4p1  10432  isfin5-2  10508  canthnum  10773  canthwe  10775  canthp1  10778  gchdjuidm  10792  gchxpidm  10793  gchhar  10803  axgroth6  10952  hashsdom  14566  ruc  16455  iscard5  44798
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