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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 6393 | . . . . . 6 ⊢ (Lim 𝐶 → Ord 𝐶) | |
| 2 | elex 3468 | . . . . . 6 ⊢ (𝐶 ∈ 𝑉 → 𝐶 ∈ V) | |
| 3 | 1, 2 | anim12i 613 | . . . . 5 ⊢ ((Lim 𝐶 ∧ 𝐶 ∈ 𝑉) → (Ord 𝐶 ∧ 𝐶 ∈ V)) |
| 4 | elon2 6343 | . . . . 5 ⊢ (𝐶 ∈ On ↔ (Ord 𝐶 ∧ 𝐶 ∈ V)) | |
| 5 | 3, 4 | sylibr 234 | . . . 4 ⊢ ((Lim 𝐶 ∧ 𝐶 ∈ 𝑉) → 𝐶 ∈ On) |
| 6 | 5 | 3ad2ant3 1135 | . . 3 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ 𝐶 ∧ (Lim 𝐶 ∧ 𝐶 ∈ 𝑉)) → 𝐶 ∈ On) |
| 7 | simp1 1136 | . . 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 1137 | . 2 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ 𝐶 ∧ (Lim 𝐶 ∧ 𝐶 ∈ 𝑉)) → 𝐵 ∈ 𝐶) | |
| 10 | oaordi 8510 | . 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 1086 ∈ wcel 2109 Vcvv 3447 Ord word 6331 Oncon0 6332 Lim wlim 6333 (class class class)co 7387 +o coa 8431 |
| 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 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-rep 5234 ax-sep 5251 ax-nul 5261 ax-pr 5387 ax-un 7711 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-ral 3045 df-rex 3054 df-reu 3355 df-rab 3406 df-v 3449 df-sbc 3754 df-csb 3863 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-pss 3934 df-nul 4297 df-if 4489 df-pw 4565 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4872 df-iun 4957 df-br 5108 df-opab 5170 df-mpt 5189 df-tr 5215 df-id 5533 df-eprel 5538 df-po 5546 df-so 5547 df-fr 5591 df-we 5593 df-xp 5644 df-rel 5645 df-cnv 5646 df-co 5647 df-dm 5648 df-rn 5649 df-res 5650 df-ima 5651 df-pred 6274 df-ord 6335 df-on 6336 df-lim 6337 df-suc 6338 df-iota 6464 df-fun 6513 df-fn 6514 df-f 6515 df-f1 6516 df-fo 6517 df-f1o 6518 df-fv 6519 df-ov 7390 df-oprab 7391 df-mpo 7392 df-2nd 7969 df-frecs 8260 df-wrecs 8291 df-recs 8340 df-rdg 8378 df-oadd 8438 |
| This theorem is referenced by: (None) |
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