| Mathbox for Thierry Arnoux |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > prct | Structured version Visualization version GIF version | ||
| Description: An unordered pair is countable. (Contributed by Thierry Arnoux, 16-Sep-2016.) |
| Ref | Expression |
|---|---|
| prct | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → {𝐴, 𝐵} ≼ ω) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-pr 4585 | . 2 ⊢ {𝐴, 𝐵} = ({𝐴} ∪ {𝐵}) | |
| 2 | snct 32801 | . . 3 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≼ ω) | |
| 3 | snct 32801 | . . 3 ⊢ (𝐵 ∈ 𝑊 → {𝐵} ≼ ω) | |
| 4 | unctb 10126 | . . 3 ⊢ (({𝐴} ≼ ω ∧ {𝐵} ≼ ω) → ({𝐴} ∪ {𝐵}) ≼ ω) | |
| 5 | 2, 3, 4 | syl2an 597 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ({𝐴} ∪ {𝐵}) ≼ ω) |
| 6 | 1, 5 | eqbrtrid 5135 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → {𝐴, 𝐵} ≼ ω) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2114 ∪ cun 3901 {csn 4582 {cpr 4584 class class class wbr 5100 ωcom 7818 ≼ cdom 8893 |
| 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 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 ax-inf2 9562 |
| 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-rmo 3352 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-int 4905 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-se 5586 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-ord 6328 df-on 6329 df-lim 6330 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-isom 6509 df-riota 7325 df-ov 7371 df-om 7819 df-1st 7943 df-2nd 7944 df-frecs 8233 df-wrecs 8264 df-recs 8313 df-rdg 8351 df-1o 8407 df-2o 8408 df-er 8645 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 df-oi 9427 df-dju 9825 df-card 9863 |
| This theorem is referenced by: difelsiga 34310 unelsiga 34311 unelldsys 34335 measxun2 34387 measssd 34392 carsgsigalem 34492 carsgclctun 34498 pmeasmono 34501 probun 34596 |
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