Theorem nadd2rabtr 43800

Description: The set of ordinals which have a natural sum less than some ordinal is transitive. (Contributed by RP, 20-Dec-2024.)

Assertion

Ref	Expression
nadd2rabtr	⊢ ((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → Tr {𝑥 ∈ 𝐴 ∣ (𝐵 +no 𝑥) ∈ 𝐶})

Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑥,𝐶

Proof of Theorem nadd2rabtr

Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpll1 1214	. . . . . . 7 ⊢ ((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) → Ord 𝐴)
2		simplr 769	. . . . . . 7 ⊢ ((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) → 𝑦 ∈ 𝐴)
3		ordelss 6328	. . . . . . 7 ⊢ ((Ord 𝐴 ∧ 𝑦 ∈ 𝐴) → 𝑦 ⊆ 𝐴)
4	1, 2, 3	syl2anc 585	. . . . . 6 ⊢ ((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) → 𝑦 ⊆ 𝐴)
5		simpll3 1216	. . . . . . . 8 ⊢ ((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) → 𝐶 ∈ On)
6	5	adantr 480	. . . . . . 7 ⊢ (((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) ∧ 𝑥 ∈ 𝑦) → 𝐶 ∈ On)
7		simpr 484	. . . . . . . . 9 ⊢ (((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) ∧ 𝑥 ∈ 𝑦) → 𝑥 ∈ 𝑦)
8	1	adantr 480	. . . . . . . . . . . 12 ⊢ (((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) ∧ 𝑥 ∈ 𝑦) → Ord 𝐴)
9		simpllr 776	. . . . . . . . . . . 12 ⊢ (((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) ∧ 𝑥 ∈ 𝑦) → 𝑦 ∈ 𝐴)
10		ordelon 6336	. . . . . . . . . . . 12 ⊢ ((Ord 𝐴 ∧ 𝑦 ∈ 𝐴) → 𝑦 ∈ On)
11	8, 9, 10	syl2anc 585	. . . . . . . . . . 11 ⊢ (((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) ∧ 𝑥 ∈ 𝑦) → 𝑦 ∈ On)
12		onelon 6337	. . . . . . . . . . 11 ⊢ ((𝑦 ∈ On ∧ 𝑥 ∈ 𝑦) → 𝑥 ∈ On)
13	11, 7, 12	syl2anc 585	. . . . . . . . . 10 ⊢ (((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) ∧ 𝑥 ∈ 𝑦) → 𝑥 ∈ On)
14		simpll2 1215	. . . . . . . . . . 11 ⊢ ((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) → 𝐵 ∈ On)
15	14	adantr 480	. . . . . . . . . 10 ⊢ (((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) ∧ 𝑥 ∈ 𝑦) → 𝐵 ∈ On)
16		naddel2 8613	. . . . . . . . . 10 ⊢ ((𝑥 ∈ On ∧ 𝑦 ∈ On ∧ 𝐵 ∈ On) → (𝑥 ∈ 𝑦 ↔ (𝐵 +no 𝑥) ∈ (𝐵 +no 𝑦)))
17	13, 11, 15, 16	syl3anc 1374	. . . . . . . . 9 ⊢ (((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) ∧ 𝑥 ∈ 𝑦) → (𝑥 ∈ 𝑦 ↔ (𝐵 +no 𝑥) ∈ (𝐵 +no 𝑦)))
18	7, 17	mpbid 232	. . . . . . . 8 ⊢ (((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) ∧ 𝑥 ∈ 𝑦) → (𝐵 +no 𝑥) ∈ (𝐵 +no 𝑦))
19		simplr 769	. . . . . . . 8 ⊢ (((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) ∧ 𝑥 ∈ 𝑦) → (𝐵 +no 𝑦) ∈ 𝐶)
20	18, 19	jca 511	. . . . . . 7 ⊢ (((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) ∧ 𝑥 ∈ 𝑦) → ((𝐵 +no 𝑥) ∈ (𝐵 +no 𝑦) ∧ (𝐵 +no 𝑦) ∈ 𝐶))
21		ontr1 6359	. . . . . . 7 ⊢ (𝐶 ∈ On → (((𝐵 +no 𝑥) ∈ (𝐵 +no 𝑦) ∧ (𝐵 +no 𝑦) ∈ 𝐶) → (𝐵 +no 𝑥) ∈ 𝐶))
22	6, 20, 21	sylc 65	. . . . . 6 ⊢ (((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) ∧ 𝑥 ∈ 𝑦) → (𝐵 +no 𝑥) ∈ 𝐶)
23	4, 22	ssrabdv 4006	. . . . 5 ⊢ ((((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) ∧ (𝐵 +no 𝑦) ∈ 𝐶) → 𝑦 ⊆ {𝑥 ∈ 𝐴 ∣ (𝐵 +no 𝑥) ∈ 𝐶})
24	23	ex 412	. . . 4 ⊢ (((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ∧ 𝑦 ∈ 𝐴) → ((𝐵 +no 𝑦) ∈ 𝐶 → 𝑦 ⊆ {𝑥 ∈ 𝐴 ∣ (𝐵 +no 𝑥) ∈ 𝐶}))
25	24	ralrimiva 3127	. . 3 ⊢ ((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → ∀𝑦 ∈ 𝐴 ((𝐵 +no 𝑦) ∈ 𝐶 → 𝑦 ⊆ {𝑥 ∈ 𝐴 ∣ (𝐵 +no 𝑥) ∈ 𝐶}))
26		oveq2 7364	. . . . 5 ⊢ (𝑥 = 𝑦 → (𝐵 +no 𝑥) = (𝐵 +no 𝑦))
27	26	eleq1d 2820	. . . 4 ⊢ (𝑥 = 𝑦 → ((𝐵 +no 𝑥) ∈ 𝐶 ↔ (𝐵 +no 𝑦) ∈ 𝐶))
28	27	ralrab 3637	. . 3 ⊢ (∀𝑦 ∈ {𝑥 ∈ 𝐴 ∣ (𝐵 +no 𝑥) ∈ 𝐶}𝑦 ⊆ {𝑥 ∈ 𝐴 ∣ (𝐵 +no 𝑥) ∈ 𝐶} ↔ ∀𝑦 ∈ 𝐴 ((𝐵 +no 𝑦) ∈ 𝐶 → 𝑦 ⊆ {𝑥 ∈ 𝐴 ∣ (𝐵 +no 𝑥) ∈ 𝐶}))
29	25, 28	sylibr 234	. 2 ⊢ ((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → ∀𝑦 ∈ {𝑥 ∈ 𝐴 ∣ (𝐵 +no 𝑥) ∈ 𝐶}𝑦 ⊆ {𝑥 ∈ 𝐴 ∣ (𝐵 +no 𝑥) ∈ 𝐶})
30		dftr3 5186	. 2 ⊢ (Tr {𝑥 ∈ 𝐴 ∣ (𝐵 +no 𝑥) ∈ 𝐶} ↔ ∀𝑦 ∈ {𝑥 ∈ 𝐴 ∣ (𝐵 +no 𝑥) ∈ 𝐶}𝑦 ⊆ {𝑥 ∈ 𝐴 ∣ (𝐵 +no 𝑥) ∈ 𝐶})
31	29, 30	sylibr 234	1 ⊢ ((Ord 𝐴 ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → Tr {𝑥 ∈ 𝐴 ∣ (𝐵 +no 𝑥) ∈ 𝐶})

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   ∧ w3a 1087   ∈ wcel 2114  ∀wral 3049  {crab 3387   ⊆ wss 3885  Tr wtr 5181  Ord word 6311  Oncon0 6312  (class class class)co 7356   +no cnadd 8590

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 2184  ax-ext 2707  ax-rep 5201  ax-sep 5220  ax-nul 5230  ax-pow 5296  ax-pr 5364  ax-un 7678

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 2538  df-eu 2568  df-clab 2714  df-cleq 2727  df-clel 2810  df-nfc 2884  df-ne 2931  df-ral 3050  df-rex 3060  df-reu 3341  df-rab 3388  df-v 3429  df-sbc 3726  df-csb 3834  df-dif 3888  df-un 3890  df-in 3892  df-ss 3902  df-pss 3905  df-nul 4264  df-if 4457  df-pw 4533  df-sn 4558  df-pr 4560  df-op 4564  df-uni 4841  df-int 4880  df-iun 4925  df-br 5075  df-opab 5137  df-mpt 5156  df-tr 5182  df-id 5515  df-eprel 5520  df-po 5528  df-so 5529  df-fr 5573  df-se 5574  df-we 5575  df-xp 5626  df-rel 5627  df-cnv 5628  df-co 5629  df-dm 5630  df-rn 5631  df-res 5632  df-ima 5633  df-pred 6254  df-ord 6315  df-on 6316  df-suc 6318  df-iota 6443  df-fun 6489  df-fn 6490  df-f 6491  df-f1 6492  df-fo 6493  df-f1o 6494  df-fv 6495  df-ov 7359  df-oprab 7360  df-mpo 7361  df-1st 7931  df-2nd 7932  df-frecs 8220  df-nadd 8591

This theorem is referenced by:  nadd2rabord  43801  nadd1rabtr  43804