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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 6388 | . . . . . 6 ⊢ (Lim 𝐶 → Ord 𝐶) | |
| 2 | elex 3463 | . . . . . 6 ⊢ (𝐶 ∈ 𝑉 → 𝐶 ∈ V) | |
| 3 | 1, 2 | anim12i 614 | . . . . 5 ⊢ ((Lim 𝐶 ∧ 𝐶 ∈ 𝑉) → (Ord 𝐶 ∧ 𝐶 ∈ V)) |
| 4 | elon2 6338 | . . . . 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 8485 | . 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 2114 Vcvv 3442 Ord word 6326 Oncon0 6327 Lim wlim 6328 (class class class)co 7370 +o coa 8406 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5226 ax-sep 5245 ax-nul 5255 ax-pr 5381 ax-un 7692 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5529 df-eprel 5534 df-po 5542 df-so 5543 df-fr 5587 df-we 5589 df-xp 5640 df-rel 5641 df-cnv 5642 df-co 5643 df-dm 5644 df-rn 5645 df-res 5646 df-ima 5647 df-pred 6269 df-ord 6330 df-on 6331 df-lim 6332 df-suc 6333 df-iota 6458 df-fun 6504 df-fn 6505 df-f 6506 df-f1 6507 df-fo 6508 df-f1o 6509 df-fv 6510 df-ov 7373 df-oprab 7374 df-mpo 7375 df-2nd 7946 df-frecs 8235 df-wrecs 8266 df-recs 8315 df-rdg 8353 df-oadd 8413 |
| This theorem is referenced by: (None) |
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