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Theorem brsdom 9001
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 8976 . . 3 ≺ = ( ≼ ∖ ≈ )
21eleq2i 2853 . 2 (⟨𝐴, 𝐵⟩ ∈ ≺ ↔ ⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ))
3 df-br 5104 . 2 (𝐴 ≺ 𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≺ )
4 df-br 5104 . . . 4 (𝐴 ≼ 𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≼ )
5 df-br 5104 . . . . 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 3909 . . 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 2145   ∖ cdif 3896  ⟨cop 4590   class class class wbr 5103   ≈ cen 8970   ≼ cdom 8971   ≺ csdm 8972
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 2733
This proof depends on definitions:  df-bi 210  df-an 402  df-tru 1573  df-ex 1813  df-sb 2100  df-clab 2740  df-cleq 2753  df-clel 2836  df-v 3453  df-dif 3902  df-br 5104  df-sdom 8976
This theorem is used by:  sdomdom  9007  sdomnen  9008  0sdomg  9125  sdom0  9128  sdomdomtr  9129  domsdomtr  9131  domtriord  9142  canth2  9149  sdomdomtrfi  9216  domsdomtrfi  9217  php2  9223  nnsdomo  9234  1sdom2  9239  sdom1  9241  1sdom2dom  9245  nnsdomg  9291  card2inf  9549  cardsdomelir  10054  cardsdom2  10069  fidomtri2  10075  cardmin2  10080  alephordi  10153  alephord  10154  isfin4p1  10393  isfin5-2  10469  canthnum  10734  canthwe  10736  canthp1  10739  gchdjuidm  10753  gchxpidm  10754  gchhar  10764  axgroth6  10913  hashsdom  14525  ruc  16411  iscard5  44536
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