Mathbox for Alexander van der Vekens |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > prprspr2 | Structured version Visualization version GIF version |
Description: The set of all proper unordered pairs over a given set 𝑉 is the set of all unordered pairs over that set of size two. (Contributed by AV, 29-Apr-2023.) |
Ref | Expression |
---|---|
prprspr2 | ⊢ (Pairsproper‘𝑉) = {𝑝 ∈ (Pairs‘𝑉) ∣ (♯‘𝑝) = 2} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sprval 44547 | . . . . . . 7 ⊢ (𝑉 ∈ V → (Pairs‘𝑉) = {𝑝 ∣ ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 𝑝 = {𝑎, 𝑏}}) | |
2 | 1 | abeq2d 2864 | . . . . . 6 ⊢ (𝑉 ∈ V → (𝑝 ∈ (Pairs‘𝑉) ↔ ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 𝑝 = {𝑎, 𝑏})) |
3 | 2 | anbi1d 633 | . . . . 5 ⊢ (𝑉 ∈ V → ((𝑝 ∈ (Pairs‘𝑉) ∧ (♯‘𝑝) = 2) ↔ (∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 𝑝 = {𝑎, 𝑏} ∧ (♯‘𝑝) = 2))) |
4 | r19.41vv 3252 | . . . . . 6 ⊢ (∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (𝑝 = {𝑎, 𝑏} ∧ (♯‘𝑝) = 2) ↔ (∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 𝑝 = {𝑎, 𝑏} ∧ (♯‘𝑝) = 2)) | |
5 | fveqeq2 6704 | . . . . . . . . . . 11 ⊢ (𝑝 = {𝑎, 𝑏} → ((♯‘𝑝) = 2 ↔ (♯‘{𝑎, 𝑏}) = 2)) | |
6 | hashprg 13927 | . . . . . . . . . . . 12 ⊢ ((𝑎 ∈ V ∧ 𝑏 ∈ V) → (𝑎 ≠ 𝑏 ↔ (♯‘{𝑎, 𝑏}) = 2)) | |
7 | 6 | el2v 3406 | . . . . . . . . . . 11 ⊢ (𝑎 ≠ 𝑏 ↔ (♯‘{𝑎, 𝑏}) = 2) |
8 | 5, 7 | bitr4di 292 | . . . . . . . . . 10 ⊢ (𝑝 = {𝑎, 𝑏} → ((♯‘𝑝) = 2 ↔ 𝑎 ≠ 𝑏)) |
9 | 8 | pm5.32i 578 | . . . . . . . . 9 ⊢ ((𝑝 = {𝑎, 𝑏} ∧ (♯‘𝑝) = 2) ↔ (𝑝 = {𝑎, 𝑏} ∧ 𝑎 ≠ 𝑏)) |
10 | 9 | biancomi 466 | . . . . . . . 8 ⊢ ((𝑝 = {𝑎, 𝑏} ∧ (♯‘𝑝) = 2) ↔ (𝑎 ≠ 𝑏 ∧ 𝑝 = {𝑎, 𝑏})) |
11 | 10 | a1i 11 | . . . . . . 7 ⊢ ((𝑉 ∈ V ∧ (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉)) → ((𝑝 = {𝑎, 𝑏} ∧ (♯‘𝑝) = 2) ↔ (𝑎 ≠ 𝑏 ∧ 𝑝 = {𝑎, 𝑏}))) |
12 | 11 | 2rexbidva 3208 | . . . . . 6 ⊢ (𝑉 ∈ V → (∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (𝑝 = {𝑎, 𝑏} ∧ (♯‘𝑝) = 2) ↔ ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (𝑎 ≠ 𝑏 ∧ 𝑝 = {𝑎, 𝑏}))) |
13 | 4, 12 | bitr3id 288 | . . . . 5 ⊢ (𝑉 ∈ V → ((∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 𝑝 = {𝑎, 𝑏} ∧ (♯‘𝑝) = 2) ↔ ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (𝑎 ≠ 𝑏 ∧ 𝑝 = {𝑎, 𝑏}))) |
14 | 3, 13 | bitrd 282 | . . . 4 ⊢ (𝑉 ∈ V → ((𝑝 ∈ (Pairs‘𝑉) ∧ (♯‘𝑝) = 2) ↔ ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (𝑎 ≠ 𝑏 ∧ 𝑝 = {𝑎, 𝑏}))) |
15 | 14 | abbidv 2800 | . . 3 ⊢ (𝑉 ∈ V → {𝑝 ∣ (𝑝 ∈ (Pairs‘𝑉) ∧ (♯‘𝑝) = 2)} = {𝑝 ∣ ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (𝑎 ≠ 𝑏 ∧ 𝑝 = {𝑎, 𝑏})}) |
16 | df-rab 3060 | . . . 4 ⊢ {𝑝 ∈ (Pairs‘𝑉) ∣ (♯‘𝑝) = 2} = {𝑝 ∣ (𝑝 ∈ (Pairs‘𝑉) ∧ (♯‘𝑝) = 2)} | |
17 | 16 | a1i 11 | . . 3 ⊢ (𝑉 ∈ V → {𝑝 ∈ (Pairs‘𝑉) ∣ (♯‘𝑝) = 2} = {𝑝 ∣ (𝑝 ∈ (Pairs‘𝑉) ∧ (♯‘𝑝) = 2)}) |
18 | prprval 44582 | . . 3 ⊢ (𝑉 ∈ V → (Pairsproper‘𝑉) = {𝑝 ∣ ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (𝑎 ≠ 𝑏 ∧ 𝑝 = {𝑎, 𝑏})}) | |
19 | 15, 17, 18 | 3eqtr4rd 2782 | . 2 ⊢ (𝑉 ∈ V → (Pairsproper‘𝑉) = {𝑝 ∈ (Pairs‘𝑉) ∣ (♯‘𝑝) = 2}) |
20 | rab0 4283 | . . . 4 ⊢ {𝑝 ∈ ∅ ∣ (♯‘𝑝) = 2} = ∅ | |
21 | 20 | a1i 11 | . . 3 ⊢ (¬ 𝑉 ∈ V → {𝑝 ∈ ∅ ∣ (♯‘𝑝) = 2} = ∅) |
22 | fvprc 6687 | . . . 4 ⊢ (¬ 𝑉 ∈ V → (Pairs‘𝑉) = ∅) | |
23 | 22 | rabeqdv 3385 | . . 3 ⊢ (¬ 𝑉 ∈ V → {𝑝 ∈ (Pairs‘𝑉) ∣ (♯‘𝑝) = 2} = {𝑝 ∈ ∅ ∣ (♯‘𝑝) = 2}) |
24 | fvprc 6687 | . . 3 ⊢ (¬ 𝑉 ∈ V → (Pairsproper‘𝑉) = ∅) | |
25 | 21, 23, 24 | 3eqtr4rd 2782 | . 2 ⊢ (¬ 𝑉 ∈ V → (Pairsproper‘𝑉) = {𝑝 ∈ (Pairs‘𝑉) ∣ (♯‘𝑝) = 2}) |
26 | 19, 25 | pm2.61i 185 | 1 ⊢ (Pairsproper‘𝑉) = {𝑝 ∈ (Pairs‘𝑉) ∣ (♯‘𝑝) = 2} |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ↔ wb 209 ∧ wa 399 = wceq 1543 ∈ wcel 2112 {cab 2714 ≠ wne 2932 ∃wrex 3052 {crab 3055 Vcvv 3398 ∅c0 4223 {cpr 4529 ‘cfv 6358 2c2 11850 ♯chash 13861 Pairscspr 44545 Pairspropercprpr 44580 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2018 ax-8 2114 ax-9 2122 ax-10 2143 ax-11 2160 ax-12 2177 ax-ext 2708 ax-rep 5164 ax-sep 5177 ax-nul 5184 ax-pow 5243 ax-pr 5307 ax-un 7501 ax-cnex 10750 ax-resscn 10751 ax-1cn 10752 ax-icn 10753 ax-addcl 10754 ax-addrcl 10755 ax-mulcl 10756 ax-mulrcl 10757 ax-mulcom 10758 ax-addass 10759 ax-mulass 10760 ax-distr 10761 ax-i2m1 10762 ax-1ne0 10763 ax-1rid 10764 ax-rnegex 10765 ax-rrecex 10766 ax-cnre 10767 ax-pre-lttri 10768 ax-pre-lttrn 10769 ax-pre-ltadd 10770 ax-pre-mulgt0 10771 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3or 1090 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2073 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2728 df-clel 2809 df-nfc 2879 df-ne 2933 df-nel 3037 df-ral 3056 df-rex 3057 df-reu 3058 df-rab 3060 df-v 3400 df-sbc 3684 df-csb 3799 df-dif 3856 df-un 3858 df-in 3860 df-ss 3870 df-pss 3872 df-nul 4224 df-if 4426 df-pw 4501 df-sn 4528 df-pr 4530 df-tp 4532 df-op 4534 df-uni 4806 df-int 4846 df-iun 4892 df-br 5040 df-opab 5102 df-mpt 5121 df-tr 5147 df-id 5440 df-eprel 5445 df-po 5453 df-so 5454 df-fr 5494 df-we 5496 df-xp 5542 df-rel 5543 df-cnv 5544 df-co 5545 df-dm 5546 df-rn 5547 df-res 5548 df-ima 5549 df-pred 6140 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6316 df-fun 6360 df-fn 6361 df-f 6362 df-f1 6363 df-fo 6364 df-f1o 6365 df-fv 6366 df-riota 7148 df-ov 7194 df-oprab 7195 df-mpo 7196 df-om 7623 df-1st 7739 df-2nd 7740 df-wrecs 8025 df-recs 8086 df-rdg 8124 df-1o 8180 df-oadd 8184 df-er 8369 df-en 8605 df-dom 8606 df-sdom 8607 df-fin 8608 df-dju 9482 df-card 9520 df-pnf 10834 df-mnf 10835 df-xr 10836 df-ltxr 10837 df-le 10838 df-sub 11029 df-neg 11030 df-nn 11796 df-2 11858 df-n0 12056 df-z 12142 df-uz 12404 df-fz 13061 df-hash 13862 df-spr 44546 df-prpr 44581 |
This theorem is referenced by: prprsprreu 44587 |
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