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| Mirrors > Home > MPE Home > Th. List > Mathboxes > oege2 | Structured version Visualization version GIF version | ||
| Description: Any power of an ordinal at least as large as two is greater-than-or-equal to the term on the right. Lemma 3.20 of [Schloeder] p. 10. See oeworde 8631. (Contributed by RP, 29-Jan-2025.) |
| Ref | Expression |
|---|---|
| oege2 | ⊢ (((𝐴 ∈ On ∧ 1o ∈ 𝐴) ∧ 𝐵 ∈ On) → 𝐵 ⊆ (𝐴 ↑o 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 2on 8520 | . . . . 5 ⊢ 2o ∈ On | |
| 2 | 1oex 8516 | . . . . . . 7 ⊢ 1o ∈ V | |
| 3 | 2 | prid2 4763 | . . . . . 6 ⊢ 1o ∈ {∅, 1o} |
| 4 | df2o3 8514 | . . . . . 6 ⊢ 2o = {∅, 1o} | |
| 5 | 3, 4 | eleqtrri 2840 | . . . . 5 ⊢ 1o ∈ 2o |
| 6 | ondif2 8540 | . . . . 5 ⊢ (2o ∈ (On ∖ 2o) ↔ (2o ∈ On ∧ 1o ∈ 2o)) | |
| 7 | 1, 5, 6 | mpbir2an 711 | . . . 4 ⊢ 2o ∈ (On ∖ 2o) |
| 8 | oeworde 8631 | . . . 4 ⊢ ((2o ∈ (On ∖ 2o) ∧ 𝐵 ∈ On) → 𝐵 ⊆ (2o ↑o 𝐵)) | |
| 9 | 7, 8 | mpan 690 | . . 3 ⊢ (𝐵 ∈ On → 𝐵 ⊆ (2o ↑o 𝐵)) |
| 10 | 9 | adantl 481 | . 2 ⊢ (((𝐴 ∈ On ∧ 1o ∈ 𝐴) ∧ 𝐵 ∈ On) → 𝐵 ⊆ (2o ↑o 𝐵)) |
| 11 | df-2o 8507 | . . . 4 ⊢ 2o = suc 1o | |
| 12 | onsucss 43279 | . . . . . 6 ⊢ (𝐴 ∈ On → (1o ∈ 𝐴 → suc 1o ⊆ 𝐴)) | |
| 13 | 12 | imp 406 | . . . . 5 ⊢ ((𝐴 ∈ On ∧ 1o ∈ 𝐴) → suc 1o ⊆ 𝐴) |
| 14 | 13 | adantr 480 | . . . 4 ⊢ (((𝐴 ∈ On ∧ 1o ∈ 𝐴) ∧ 𝐵 ∈ On) → suc 1o ⊆ 𝐴) |
| 15 | 11, 14 | eqsstrid 4022 | . . 3 ⊢ (((𝐴 ∈ On ∧ 1o ∈ 𝐴) ∧ 𝐵 ∈ On) → 2o ⊆ 𝐴) |
| 16 | simpll 767 | . . . . 5 ⊢ (((𝐴 ∈ On ∧ 1o ∈ 𝐴) ∧ 𝐵 ∈ On) → 𝐴 ∈ On) | |
| 17 | onsseleq 6425 | . . . . 5 ⊢ ((2o ∈ On ∧ 𝐴 ∈ On) → (2o ⊆ 𝐴 ↔ (2o ∈ 𝐴 ∨ 2o = 𝐴))) | |
| 18 | 1, 16, 17 | sylancr 587 | . . . 4 ⊢ (((𝐴 ∈ On ∧ 1o ∈ 𝐴) ∧ 𝐵 ∈ On) → (2o ⊆ 𝐴 ↔ (2o ∈ 𝐴 ∨ 2o = 𝐴))) |
| 19 | oewordri 8630 | . . . . . 6 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (2o ∈ 𝐴 → (2o ↑o 𝐵) ⊆ (𝐴 ↑o 𝐵))) | |
| 20 | 19 | adantlr 715 | . . . . 5 ⊢ (((𝐴 ∈ On ∧ 1o ∈ 𝐴) ∧ 𝐵 ∈ On) → (2o ∈ 𝐴 → (2o ↑o 𝐵) ⊆ (𝐴 ↑o 𝐵))) |
| 21 | oveq1 7438 | . . . . . . 7 ⊢ (2o = 𝐴 → (2o ↑o 𝐵) = (𝐴 ↑o 𝐵)) | |
| 22 | ssid 4006 | . . . . . . 7 ⊢ (𝐴 ↑o 𝐵) ⊆ (𝐴 ↑o 𝐵) | |
| 23 | 21, 22 | eqsstrdi 4028 | . . . . . 6 ⊢ (2o = 𝐴 → (2o ↑o 𝐵) ⊆ (𝐴 ↑o 𝐵)) |
| 24 | 23 | a1i 11 | . . . . 5 ⊢ (((𝐴 ∈ On ∧ 1o ∈ 𝐴) ∧ 𝐵 ∈ On) → (2o = 𝐴 → (2o ↑o 𝐵) ⊆ (𝐴 ↑o 𝐵))) |
| 25 | 20, 24 | jaod 860 | . . . 4 ⊢ (((𝐴 ∈ On ∧ 1o ∈ 𝐴) ∧ 𝐵 ∈ On) → ((2o ∈ 𝐴 ∨ 2o = 𝐴) → (2o ↑o 𝐵) ⊆ (𝐴 ↑o 𝐵))) |
| 26 | 18, 25 | sylbid 240 | . . 3 ⊢ (((𝐴 ∈ On ∧ 1o ∈ 𝐴) ∧ 𝐵 ∈ On) → (2o ⊆ 𝐴 → (2o ↑o 𝐵) ⊆ (𝐴 ↑o 𝐵))) |
| 27 | 15, 26 | mpd 15 | . 2 ⊢ (((𝐴 ∈ On ∧ 1o ∈ 𝐴) ∧ 𝐵 ∈ On) → (2o ↑o 𝐵) ⊆ (𝐴 ↑o 𝐵)) |
| 28 | 10, 27 | sstrd 3994 | 1 ⊢ (((𝐴 ∈ On ∧ 1o ∈ 𝐴) ∧ 𝐵 ∈ On) → 𝐵 ⊆ (𝐴 ↑o 𝐵)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∨ wo 848 = wceq 1540 ∈ wcel 2108 ∖ cdif 3948 ⊆ wss 3951 ∅c0 4333 {cpr 4628 Oncon0 6384 suc csuc 6386 (class class class)co 7431 1oc1o 8499 2oc2o 8500 ↑o coe 8505 |
| 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 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-rep 5279 ax-sep 5296 ax-nul 5306 ax-pr 5432 ax-un 7755 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-ral 3062 df-rex 3071 df-reu 3381 df-rab 3437 df-v 3482 df-sbc 3789 df-csb 3900 df-dif 3954 df-un 3956 df-in 3958 df-ss 3968 df-pss 3971 df-nul 4334 df-if 4526 df-pw 4602 df-sn 4627 df-pr 4629 df-op 4633 df-uni 4908 df-iun 4993 df-br 5144 df-opab 5206 df-mpt 5226 df-tr 5260 df-id 5578 df-eprel 5584 df-po 5592 df-so 5593 df-fr 5637 df-we 5639 df-xp 5691 df-rel 5692 df-cnv 5693 df-co 5694 df-dm 5695 df-rn 5696 df-res 5697 df-ima 5698 df-pred 6321 df-ord 6387 df-on 6388 df-lim 6389 df-suc 6390 df-iota 6514 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-ov 7434 df-oprab 7435 df-mpo 7436 df-om 7888 df-2nd 8015 df-frecs 8306 df-wrecs 8337 df-recs 8411 df-rdg 8450 df-1o 8506 df-2o 8507 df-oadd 8510 df-omul 8511 df-oexp 8512 |
| This theorem is referenced by: (None) |
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