Theorem brsdom 8915

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 8890	. . 3 ⊢ ≺ = ( ≼ ∖ ≈ )
2	1	eleq2i 2833	. 2 ⊢ (⟨𝐴, 𝐵⟩ ∈ ≺ ↔ ⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ))
3		df-br 5076	. 2 ⊢ (𝐴 ≺ 𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≺ )
4		df-br 5076	. . . 4 ⊢ (𝐴 ≼ 𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≼ )
5		df-br 5076	. . . . 5 ⊢ (𝐴 ≈ 𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≈ )
6	5	notbii 322	. . . 4 ⊢ (¬ 𝐴 ≈ 𝐵 ↔ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ )
7	4, 6	anbi12i 635	. . 3 ⊢ ((𝐴 ≼ 𝐵 ∧ ¬ 𝐴 ≈ 𝐵) ↔ (⟨𝐴, 𝐵⟩ ∈ ≼ ∧ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ ))
8		eldif 3895	. . 3 ⊢ (⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ) ↔ (⟨𝐴, 𝐵⟩ ∈ ≼ ∧ ¬ ⟨𝐴, 𝐵⟩ ∈ ≈ ))
9	7, 8	bitr4i 280	. 2 ⊢ ((𝐴 ≼ 𝐵 ∧ ¬ 𝐴 ≈ 𝐵) ↔ ⟨𝐴, 𝐵⟩ ∈ ( ≼ ∖ ≈ ))
10	2, 3, 9	3bitr4i 305	1 ⊢ (𝐴 ≺ 𝐵 ↔ (𝐴 ≼ 𝐵 ∧ ¬ 𝐴 ≈ 𝐵))

Syntax hints:  ¬ wn 3   ↔ wb 208   ∧ wa 397   ∈ wcel 2121   ∖ cdif 3882  ⟨cop 4564   class class class wbr 5075   ≈ cen 8884   ≼ cdom 8885   ≺ csdm 8886

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1975  ax-7 2016  ax-8 2123  ax-9 2131  ax-ext 2713

This theorem depends on definitions:  df-bi 209  df-an 398  df-tru 1551  df-ex 1788  df-sb 2075  df-clab 2720  df-cleq 2733  df-clel 2816  df-v 3435  df-dif 3888  df-br 5076  df-sdom 8890

This theorem is referenced by:  sdomdom  8921  sdomnen  8922  0sdomg  9038  sdom0  9041  sdomdomtr  9042  domsdomtr  9044  domtriord  9055  canth2  9062  sdomdomtrfi  9129  domsdomtrfi  9130  php2  9136  nnsdomo  9147  1sdom2  9152  sdom1  9154  1sdom2dom  9158  nnsdomg  9203  card2inf  9464  cardsdomelir  9892  cardsdom2  9907  fidomtri2  9913  cardmin2  9918  alephordi  9991  alephord  9992  isfin4p1  10232  isfin5-2  10308  canthnum  10567  canthwe  10569  canthp1  10572  gchdjuidm  10586  gchxpidm  10587  gchhar  10597  axgroth6  10746  hashsdom  14338  ruc  16205  iscard5  43995