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Theorem brsdom 8981
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 8956 . . 3 ≺ = ( ≼ ∖ ≈ )
21eleq2i 2852 . 2 (⟨𝐴, 𝐵⟩ ∈ ≺ ↔ ⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ))
3 df-br 5104 . 2 (𝐴𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≺ )
4 df-br 5104 . . . 4 (𝐴𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≼ )
5 df-br 5104 . . . . 5 (𝐴𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≈ )
65notbii 323 . . . 4 𝐴𝐵 ↔ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ )
74, 6anbi12i 640 . . 3 ((𝐴𝐵 ∧ ¬ 𝐴𝐵) ↔ (⟨𝐴, 𝐵⟩ ∈ ≼ ∧ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ ))
8 eldif 3909 . . 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 2145  cdif 3896  cop 4590   class class class wbr 5103  cen 8950  cdom 8951  csdm 8952
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 2147  ax-9 2155  ax-ext 2732
This proof depends on definitions:  df-bi 210  df-an 402  df-tru 1573  df-ex 1813  df-sb 2100  df-clab 2739  df-cleq 2752  df-clel 2835  df-v 3452  df-dif 3902  df-br 5104  df-sdom 8956
This theorem is used by:  sdomdom  8987  sdomnen  8988  0sdomg  9105  sdom0  9108  sdomdomtr  9109  domsdomtr  9111  domtriord  9122  canth2  9129  sdomdomtrfi  9196  domsdomtrfi  9197  php2  9203  nnsdomo  9214  1sdom2  9219  sdom1  9221  1sdom2dom  9225  nnsdomg  9270  card2inf  9528  cardsdomelir  9979  cardsdom2  9994  fidomtri2  10000  cardmin2  10005  alephordi  10078  alephord  10079  isfin4p1  10318  isfin5-2  10394  canthnum  10659  canthwe  10661  canthp1  10664  gchdjuidm  10678  gchxpidm  10679  gchhar  10689  axgroth6  10838  hashsdom  14446  ruc  16332  iscard5  44377
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