Theorem brsdom 8946

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

Step	Hyp	Ref	Expression
1		df-sdom 8921	. . 3 ⊢ ≺ = ( ≼ ∖ ≈ )
2	1	eleq2i 2820	. 2 ⊢ (⟨𝐴, 𝐵⟩ ∈ ≺ ↔ ⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ))
3		df-br 5108	. 2 ⊢ (𝐴 ≺ 𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≺ )
4		df-br 5108	. . . 4 ⊢ (𝐴 ≼ 𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≼ )
5		df-br 5108	. . . . 5 ⊢ (𝐴 ≈ 𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≈ )
6	5	notbii 320	. . . 4 ⊢ (¬ 𝐴 ≈ 𝐵 ↔ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ )
7	4, 6	anbi12i 628	. . 3 ⊢ ((𝐴 ≼ 𝐵 ∧ ¬ 𝐴 ≈ 𝐵) ↔ (⟨𝐴, 𝐵⟩ ∈ ≼ ∧ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ ))
8		eldif 3924	. . 3 ⊢ (⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ) ↔ (⟨𝐴, 𝐵⟩ ∈ ≼ ∧ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ ))
9	7, 8	bitr4i 278	. 2 ⊢ ((𝐴 ≼ 𝐵 ∧ ¬ 𝐴 ≈ 𝐵) ↔ ⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ))
10	2, 3, 9	3bitr4i 303	1 ⊢ (𝐴 ≺ 𝐵 ↔ (𝐴 ≼ 𝐵 ∧ ¬ 𝐴 ≈ 𝐵))

Syntax hints:  ¬ wn 3   ↔ wb 206   ∧ wa 395   ∈ wcel 2109   ∖ cdif 3911  ⟨cop 4595   class class class wbr 5107   ≈ cen 8915   ≼ cdom 8916   ≺ csdm 8917

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 2008  ax-8 2111  ax-9 2119  ax-ext 2701

This theorem depends on definitions:  df-bi 207  df-an 396  df-tru 1543  df-ex 1780  df-sb 2066  df-clab 2708  df-cleq 2721  df-clel 2803  df-v 3449  df-dif 3917  df-br 5108  df-sdom 8921

This theorem is referenced by:  sdomdom  8951  sdomnen  8952  0sdomg  9070  sdom0  9073  sdomdomtr  9074  domsdomtr  9076  domtriord  9087  canth2  9094  sdomdomtrfi  9165  domsdomtrfi  9166  php2  9172  nnsdomo  9182  1sdom2  9187  sdom1  9189  1sdom2dom  9194  nnsdomg  9246  nnsdomgOLD  9247  card2inf  9508  cardsdomelir  9926  cardsdom2  9941  fidomtri2  9947  cardmin2  9952  alephordi  10027  alephord  10028  isfin4p1  10268  isfin5-2  10344  canthnum  10602  canthwe  10604  canthp1  10607  gchdjuidm  10621  gchxpidm  10622  gchhar  10632  axgroth6  10781  hashsdom  14346  ruc  16211  iscard5  43525