| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > MPE Home > Th. List > ordelssne | Structured version Visualization version GIF version | ||
| Description: For ordinal classes, membership is equivalent to strict inclusion. Corollary 7.8 of [TakeutiZaring] p. 37. (Contributed by NM, 25-Nov-1995.) |
| Ref | Expression |
|---|---|
| ordelssne | ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → (𝐴 ∈ 𝐵 ↔ (𝐴 ⊆ 𝐵 ∧ 𝐴 ≠ 𝐵))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ordtr 6324 | . . 3 ⊢ (Ord 𝐴 → Tr 𝐴) | |
| 2 | tz7.7 6336 | . . 3 ⊢ ((Ord 𝐵 ∧ Tr 𝐴) → (𝐴 ∈ 𝐵 ↔ (𝐴 ⊆ 𝐵 ∧ 𝐴 ≠ 𝐵))) | |
| 3 | 1, 2 | sylan2 599 | . 2 ⊢ ((Ord 𝐵 ∧ Ord 𝐴) → (𝐴 ∈ 𝐵 ↔ (𝐴 ⊆ 𝐵 ∧ 𝐴 ≠ 𝐵))) |
| 4 | 3 | ancoms 459 | 1 ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → (𝐴 ∈ 𝐵 ↔ (𝐴 ⊆ 𝐵 ∧ 𝐴 ≠ 𝐵))) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 207 ∧ wa 396 ∈ wcel 2119 ≠ wne 2934 ⊆ wss 3883 Tr wtr 5179 Ord word 6309 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-ext 2711 ax-sep 5218 ax-pr 5362 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-sb 2074 df-clab 2718 df-cleq 2731 df-clel 2814 df-ne 2935 df-ral 3054 df-rex 3064 df-rab 3392 df-v 3433 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4262 df-if 4455 df-pw 4531 df-sn 4556 df-pr 4558 df-op 4562 df-uni 4839 df-br 5073 df-opab 5135 df-tr 5180 df-eprel 5518 df-po 5526 df-so 5527 df-fr 5571 df-we 5573 df-ord 6313 |
| This theorem is referenced by: ordelpss 6338 onelpss 6350 orduniorsuc 7770 ominf 9164 cutbdaybnd2lim 27807 |
| Copyright terms: Public domain | W3C validator |