Theorem onelpss 6380

Description: Relationship between membership and proper subset of an ordinal number. (Contributed by NM, 15-Sep-1995.)

Assertion

Ref	Expression
onelpss	⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (𝐴 ∈ 𝐵 ↔ (𝐴 ⊆ 𝐵 ∧ 𝐴 ≠ 𝐵)))

Proof of Theorem onelpss

Step	Hyp	Ref	Expression
1		eloni 6350	. 2 ⊢ (𝐴 ∈ On → Ord 𝐴)
2		eloni 6350	. 2 ⊢ (𝐵 ∈ On → Ord 𝐵)
3		ordelssne 6367	. 2 ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → (𝐴 ∈ 𝐵 ↔ (𝐴 ⊆ 𝐵 ∧ 𝐴 ≠ 𝐵)))
4	1, 2, 3	syl2an 605	1 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (𝐴 ∈ 𝐵 ↔ (𝐴 ⊆ 𝐵 ∧ 𝐴 ≠ 𝐵)))

Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 399   ∈ wcel 2141   ≠ wne 2956   ⊆ wss 3902  Ord word 6339  Oncon0 6340

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-8 2143  ax-9 2151  ax-ext 2733  ax-sep 5243  ax-pr 5387

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3or 1098  df-3an 1099  df-tru 1562  df-fal 1572  df-ex 1799  df-sb 2090  df-clab 2740  df-cleq 2753  df-clel 2836  df-ne 2957  df-ral 3076  df-rex 3086  df-rab 3414  df-v 3455  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-nul 4284  df-if 4478  df-pw 4554  df-sn 4580  df-pr 4582  df-op 4586  df-uni 4863  df-br 5098  df-opab 5160  df-tr 5205  df-eprel 5543  df-po 5551  df-so 5552  df-fr 5596  df-we 5598  df-ord 6343  df-on 6344

This theorem is referenced by:  tfindsg  7835  findsg  7872  oancom  9599  cardsdom2  9939  alephord  10024  cutbdaylt  27878  omabs2  43869  naddwordnexlem4  43938  omssrncard  44076