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Mirrors > Home > ILE Home > Th. List > ordelss | GIF version |
Description: An element of an ordinal class is a subset of it. (Contributed by NM, 30-May-1994.) |
Ref | Expression |
---|---|
ordelss | ⊢ ((Ord 𝐴 ∧ 𝐵 ∈ 𝐴) → 𝐵 ⊆ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ordtr 4295 | . 2 ⊢ (Ord 𝐴 → Tr 𝐴) | |
2 | trss 4030 | . . 3 ⊢ (Tr 𝐴 → (𝐵 ∈ 𝐴 → 𝐵 ⊆ 𝐴)) | |
3 | 2 | imp 123 | . 2 ⊢ ((Tr 𝐴 ∧ 𝐵 ∈ 𝐴) → 𝐵 ⊆ 𝐴) |
4 | 1, 3 | sylan 281 | 1 ⊢ ((Ord 𝐴 ∧ 𝐵 ∈ 𝐴) → 𝐵 ⊆ 𝐴) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ∈ wcel 1480 ⊆ wss 3066 Tr wtr 4021 Ord word 4279 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ral 2419 df-v 2683 df-in 3072 df-ss 3079 df-uni 3732 df-tr 4022 df-iord 4283 |
This theorem is referenced by: ordelord 4298 onelss 4304 ordsuc 4473 smores3 6183 tfrlem1 6198 tfrlemisucaccv 6215 tfrlemiubacc 6220 tfr1onlemsucaccv 6231 tfr1onlemubacc 6236 tfrcllemsucaccv 6244 tfrcllemubacc 6249 nntri1 6385 nnsseleq 6390 fict 6755 infnfi 6782 isinfinf 6784 ordiso2 6913 hashinfuni 10516 |
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