| 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 4604 | . 2 ⊢ {𝐴, 𝐵} = ({𝐴} ∪ {𝐵}) | |
| 2 | snct 32691 | . . 3 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≼ ω) | |
| 3 | snct 32691 | . . 3 ⊢ (𝐵 ∈ 𝑊 → {𝐵} ≼ ω) | |
| 4 | unctb 10218 | . . 3 ⊢ (({𝐴} ≼ ω ∧ {𝐵} ≼ ω) → ({𝐴} ∪ {𝐵}) ≼ ω) | |
| 5 | 2, 3, 4 | syl2an 596 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ({𝐴} ∪ {𝐵}) ≼ ω) |
| 6 | 1, 5 | eqbrtrid 5154 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → {𝐴, 𝐵} ≼ ω) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2108 ∪ cun 3924 {csn 4601 {cpr 4603 class class class wbr 5119 ωcom 7861 ≼ cdom 8957 |
| 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 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2707 ax-rep 5249 ax-sep 5266 ax-nul 5276 ax-pow 5335 ax-pr 5402 ax-un 7729 ax-inf2 9655 |
| 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 2065 df-mo 2539 df-eu 2568 df-clab 2714 df-cleq 2727 df-clel 2809 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3061 df-rmo 3359 df-reu 3360 df-rab 3416 df-v 3461 df-sbc 3766 df-csb 3875 df-dif 3929 df-un 3931 df-in 3933 df-ss 3943 df-pss 3946 df-nul 4309 df-if 4501 df-pw 4577 df-sn 4602 df-pr 4604 df-op 4608 df-uni 4884 df-int 4923 df-iun 4969 df-br 5120 df-opab 5182 df-mpt 5202 df-tr 5230 df-id 5548 df-eprel 5553 df-po 5561 df-so 5562 df-fr 5606 df-se 5607 df-we 5608 df-xp 5660 df-rel 5661 df-cnv 5662 df-co 5663 df-dm 5664 df-rn 5665 df-res 5666 df-ima 5667 df-pred 6290 df-ord 6355 df-on 6356 df-lim 6357 df-suc 6358 df-iota 6484 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-fv 6539 df-isom 6540 df-riota 7362 df-ov 7408 df-om 7862 df-1st 7988 df-2nd 7989 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-1o 8480 df-2o 8481 df-er 8719 df-en 8960 df-dom 8961 df-sdom 8962 df-fin 8963 df-oi 9524 df-dju 9915 df-card 9953 |
| This theorem is referenced by: difelsiga 34164 unelsiga 34165 unelldsys 34189 measxun2 34241 measssd 34246 carsgsigalem 34347 carsgclctun 34353 pmeasmono 34356 probun 34451 |
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