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Mirrors > Home > MPE Home > Th. List > Mathboxes > oaltublim | Structured version Visualization version GIF version |
Description: Given 𝐶 is a limit ordinal, the sum of any ordinal with an ordinal less than 𝐶 is less than the sum of the first ordinal with 𝐶. Lemma 3.5 of [Schloeder] p. 7. (Contributed by RP, 29-Jan-2025.) |
Ref | Expression |
---|---|
oaltublim | ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ 𝐶 ∧ (Lim 𝐶 ∧ 𝐶 ∈ 𝑉)) → (𝐴 +o 𝐵) ∈ (𝐴 +o 𝐶)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | limord 6452 | . . . . . 6 ⊢ (Lim 𝐶 → Ord 𝐶) | |
2 | elex 3502 | . . . . . 6 ⊢ (𝐶 ∈ 𝑉 → 𝐶 ∈ V) | |
3 | 1, 2 | anim12i 613 | . . . . 5 ⊢ ((Lim 𝐶 ∧ 𝐶 ∈ 𝑉) → (Ord 𝐶 ∧ 𝐶 ∈ V)) |
4 | elon2 6403 | . . . . 5 ⊢ (𝐶 ∈ On ↔ (Ord 𝐶 ∧ 𝐶 ∈ V)) | |
5 | 3, 4 | sylibr 234 | . . . 4 ⊢ ((Lim 𝐶 ∧ 𝐶 ∈ 𝑉) → 𝐶 ∈ On) |
6 | 5 | 3ad2ant3 1136 | . . 3 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ 𝐶 ∧ (Lim 𝐶 ∧ 𝐶 ∈ 𝑉)) → 𝐶 ∈ On) |
7 | simp1 1137 | . . 3 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ 𝐶 ∧ (Lim 𝐶 ∧ 𝐶 ∈ 𝑉)) → 𝐴 ∈ On) | |
8 | 6, 7 | jca 511 | . 2 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ 𝐶 ∧ (Lim 𝐶 ∧ 𝐶 ∈ 𝑉)) → (𝐶 ∈ On ∧ 𝐴 ∈ On)) |
9 | simp2 1138 | . 2 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ 𝐶 ∧ (Lim 𝐶 ∧ 𝐶 ∈ 𝑉)) → 𝐵 ∈ 𝐶) | |
10 | oaordi 8592 | . 2 ⊢ ((𝐶 ∈ On ∧ 𝐴 ∈ On) → (𝐵 ∈ 𝐶 → (𝐴 +o 𝐵) ∈ (𝐴 +o 𝐶))) | |
11 | 8, 9, 10 | sylc 65 | 1 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ 𝐶 ∧ (Lim 𝐶 ∧ 𝐶 ∈ 𝑉)) → (𝐴 +o 𝐵) ∈ (𝐴 +o 𝐶)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 ∧ w3a 1087 ∈ wcel 2108 Vcvv 3481 Ord word 6391 Oncon0 6392 Lim wlim 6393 (class class class)co 7438 +o coa 8511 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1794 ax-4 1808 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 5288 ax-sep 5305 ax-nul 5315 ax-pr 5441 ax-un 7761 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1542 df-fal 1552 df-ex 1779 df-nf 1783 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 3483 df-sbc 3795 df-csb 3912 df-dif 3969 df-un 3971 df-in 3973 df-ss 3983 df-pss 3986 df-nul 4343 df-if 4535 df-pw 4610 df-sn 4635 df-pr 4637 df-op 4641 df-uni 4916 df-iun 5001 df-br 5152 df-opab 5214 df-mpt 5235 df-tr 5269 df-id 5587 df-eprel 5593 df-po 5601 df-so 5602 df-fr 5645 df-we 5647 df-xp 5699 df-rel 5700 df-cnv 5701 df-co 5702 df-dm 5703 df-rn 5704 df-res 5705 df-ima 5706 df-pred 6329 df-ord 6395 df-on 6396 df-lim 6397 df-suc 6398 df-iota 6522 df-fun 6571 df-fn 6572 df-f 6573 df-f1 6574 df-fo 6575 df-f1o 6576 df-fv 6577 df-ov 7441 df-oprab 7442 df-mpo 7443 df-2nd 8023 df-frecs 8314 df-wrecs 8345 df-recs 8419 df-rdg 8458 df-oadd 8518 |
This theorem is referenced by: (None) |
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