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Mirrors > Home > MPE Home > Th. List > Mathboxes > pr2dom | Structured version Visualization version GIF version |
Description: An unordered pair is dominated by ordinal two. (Contributed by RP, 29-Oct-2023.) |
Ref | Expression |
---|---|
pr2dom | ⊢ {𝐴, 𝐵} ≼ 2o |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-pr 4634 | . 2 ⊢ {𝐴, 𝐵} = ({𝐴} ∪ {𝐵}) | |
2 | snex 5442 | . . . 4 ⊢ {𝐴} ∈ V | |
3 | snex 5442 | . . . 4 ⊢ {𝐵} ∈ V | |
4 | undjudom 10206 | . . . 4 ⊢ (({𝐴} ∈ V ∧ {𝐵} ∈ V) → ({𝐴} ∪ {𝐵}) ≼ ({𝐴} ⊔ {𝐵})) | |
5 | 2, 3, 4 | mp2an 692 | . . 3 ⊢ ({𝐴} ∪ {𝐵}) ≼ ({𝐴} ⊔ {𝐵}) |
6 | sn1dom 43516 | . . . . . 6 ⊢ {𝐴} ≼ 1o | |
7 | djudom1 10221 | . . . . . 6 ⊢ (({𝐴} ≼ 1o ∧ {𝐵} ∈ V) → ({𝐴} ⊔ {𝐵}) ≼ (1o ⊔ {𝐵})) | |
8 | 6, 3, 7 | mp2an 692 | . . . . 5 ⊢ ({𝐴} ⊔ {𝐵}) ≼ (1o ⊔ {𝐵}) |
9 | sn1dom 43516 | . . . . . 6 ⊢ {𝐵} ≼ 1o | |
10 | 1on 8517 | . . . . . 6 ⊢ 1o ∈ On | |
11 | djudom2 10222 | . . . . . 6 ⊢ (({𝐵} ≼ 1o ∧ 1o ∈ On) → (1o ⊔ {𝐵}) ≼ (1o ⊔ 1o)) | |
12 | 9, 10, 11 | mp2an 692 | . . . . 5 ⊢ (1o ⊔ {𝐵}) ≼ (1o ⊔ 1o) |
13 | domtr 9046 | . . . . 5 ⊢ ((({𝐴} ⊔ {𝐵}) ≼ (1o ⊔ {𝐵}) ∧ (1o ⊔ {𝐵}) ≼ (1o ⊔ 1o)) → ({𝐴} ⊔ {𝐵}) ≼ (1o ⊔ 1o)) | |
14 | 8, 12, 13 | mp2an 692 | . . . 4 ⊢ ({𝐴} ⊔ {𝐵}) ≼ (1o ⊔ 1o) |
15 | dju1p1e2 10212 | . . . 4 ⊢ (1o ⊔ 1o) ≈ 2o | |
16 | domentr 9052 | . . . 4 ⊢ ((({𝐴} ⊔ {𝐵}) ≼ (1o ⊔ 1o) ∧ (1o ⊔ 1o) ≈ 2o) → ({𝐴} ⊔ {𝐵}) ≼ 2o) | |
17 | 14, 15, 16 | mp2an 692 | . . 3 ⊢ ({𝐴} ⊔ {𝐵}) ≼ 2o |
18 | domtr 9046 | . . 3 ⊢ ((({𝐴} ∪ {𝐵}) ≼ ({𝐴} ⊔ {𝐵}) ∧ ({𝐴} ⊔ {𝐵}) ≼ 2o) → ({𝐴} ∪ {𝐵}) ≼ 2o) | |
19 | 5, 17, 18 | mp2an 692 | . 2 ⊢ ({𝐴} ∪ {𝐵}) ≼ 2o |
20 | 1, 19 | eqbrtri 5169 | 1 ⊢ {𝐴, 𝐵} ≼ 2o |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2106 Vcvv 3478 ∪ cun 3961 {csn 4631 {cpr 4633 class class class wbr 5148 Oncon0 6386 1oc1o 8498 2oc2o 8499 ≈ cen 8981 ≼ cdom 8982 ⊔ cdju 9936 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-ral 3060 df-rex 3069 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-pss 3983 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-op 4638 df-uni 4913 df-int 4952 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5583 df-eprel 5589 df-po 5597 df-so 5598 df-fr 5641 df-we 5643 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-ord 6389 df-on 6390 df-suc 6392 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-1st 8013 df-2nd 8014 df-1o 8505 df-2o 8506 df-er 8744 df-en 8985 df-dom 8986 df-sdom 8987 df-dju 9939 |
This theorem is referenced by: tr3dom 43518 |
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