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| Mirrors > Home > MPE Home > Th. List > Mathboxes > reuprpr | Structured version Visualization version GIF version | ||
| Description: There is a unique proper unordered pair fulfilling a wff iff there are uniquely two different sets fulfilling a corresponding wff. (Contributed by AV, 30-Apr-2023.) |
| Ref | Expression |
|---|---|
| reupr.a | ⊢ (𝑝 = {𝑎, 𝑏} → (𝜓 ↔ 𝜒)) |
| reupr.x | ⊢ (𝑝 = {𝑥, 𝑦} → (𝜓 ↔ 𝜃)) |
| Ref | Expression |
|---|---|
| reuprpr | ⊢ (𝑋 ∈ 𝑉 → (∃!𝑝 ∈ (Pairsproper‘𝑋)𝜓 ↔ ∃𝑎 ∈ 𝑋 ∃𝑏 ∈ 𝑋 (𝑎 ≠ 𝑏 ∧ 𝜒 ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 ((𝑥 ≠ 𝑦 ∧ 𝜃) → {𝑥, 𝑦} = {𝑎, 𝑏})))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | prprsprreu 47908 | . 2 ⊢ (𝑋 ∈ 𝑉 → (∃!𝑝 ∈ (Pairsproper‘𝑋)𝜓 ↔ ∃!𝑝 ∈ (Pairs‘𝑋)((♯‘𝑝) = 2 ∧ 𝜓))) | |
| 2 | fveqeq2 6853 | . . . . 5 ⊢ (𝑝 = {𝑎, 𝑏} → ((♯‘𝑝) = 2 ↔ (♯‘{𝑎, 𝑏}) = 2)) | |
| 3 | hashprg 14332 | . . . . . 6 ⊢ ((𝑎 ∈ V ∧ 𝑏 ∈ V) → (𝑎 ≠ 𝑏 ↔ (♯‘{𝑎, 𝑏}) = 2)) | |
| 4 | 3 | el2v 3449 | . . . . 5 ⊢ (𝑎 ≠ 𝑏 ↔ (♯‘{𝑎, 𝑏}) = 2) |
| 5 | 2, 4 | bitr4di 289 | . . . 4 ⊢ (𝑝 = {𝑎, 𝑏} → ((♯‘𝑝) = 2 ↔ 𝑎 ≠ 𝑏)) |
| 6 | reupr.a | . . . 4 ⊢ (𝑝 = {𝑎, 𝑏} → (𝜓 ↔ 𝜒)) | |
| 7 | 5, 6 | anbi12d 633 | . . 3 ⊢ (𝑝 = {𝑎, 𝑏} → (((♯‘𝑝) = 2 ∧ 𝜓) ↔ (𝑎 ≠ 𝑏 ∧ 𝜒))) |
| 8 | fveqeq2 6853 | . . . . 5 ⊢ (𝑝 = {𝑥, 𝑦} → ((♯‘𝑝) = 2 ↔ (♯‘{𝑥, 𝑦}) = 2)) | |
| 9 | hashprg 14332 | . . . . . 6 ⊢ ((𝑥 ∈ V ∧ 𝑦 ∈ V) → (𝑥 ≠ 𝑦 ↔ (♯‘{𝑥, 𝑦}) = 2)) | |
| 10 | 9 | el2v 3449 | . . . . 5 ⊢ (𝑥 ≠ 𝑦 ↔ (♯‘{𝑥, 𝑦}) = 2) |
| 11 | 8, 10 | bitr4di 289 | . . . 4 ⊢ (𝑝 = {𝑥, 𝑦} → ((♯‘𝑝) = 2 ↔ 𝑥 ≠ 𝑦)) |
| 12 | reupr.x | . . . 4 ⊢ (𝑝 = {𝑥, 𝑦} → (𝜓 ↔ 𝜃)) | |
| 13 | 11, 12 | anbi12d 633 | . . 3 ⊢ (𝑝 = {𝑥, 𝑦} → (((♯‘𝑝) = 2 ∧ 𝜓) ↔ (𝑥 ≠ 𝑦 ∧ 𝜃))) |
| 14 | 7, 13 | reupr 47911 | . 2 ⊢ (𝑋 ∈ 𝑉 → (∃!𝑝 ∈ (Pairs‘𝑋)((♯‘𝑝) = 2 ∧ 𝜓) ↔ ∃𝑎 ∈ 𝑋 ∃𝑏 ∈ 𝑋 ((𝑎 ≠ 𝑏 ∧ 𝜒) ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 ((𝑥 ≠ 𝑦 ∧ 𝜃) → {𝑥, 𝑦} = {𝑎, 𝑏})))) |
| 15 | df-3an 1089 | . . . . 5 ⊢ ((𝑎 ≠ 𝑏 ∧ 𝜒 ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 ((𝑥 ≠ 𝑦 ∧ 𝜃) → {𝑥, 𝑦} = {𝑎, 𝑏})) ↔ ((𝑎 ≠ 𝑏 ∧ 𝜒) ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 ((𝑥 ≠ 𝑦 ∧ 𝜃) → {𝑥, 𝑦} = {𝑎, 𝑏}))) | |
| 16 | 15 | bicomi 224 | . . . 4 ⊢ (((𝑎 ≠ 𝑏 ∧ 𝜒) ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 ((𝑥 ≠ 𝑦 ∧ 𝜃) → {𝑥, 𝑦} = {𝑎, 𝑏})) ↔ (𝑎 ≠ 𝑏 ∧ 𝜒 ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 ((𝑥 ≠ 𝑦 ∧ 𝜃) → {𝑥, 𝑦} = {𝑎, 𝑏}))) |
| 17 | 16 | a1i 11 | . . 3 ⊢ (𝑋 ∈ 𝑉 → (((𝑎 ≠ 𝑏 ∧ 𝜒) ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 ((𝑥 ≠ 𝑦 ∧ 𝜃) → {𝑥, 𝑦} = {𝑎, 𝑏})) ↔ (𝑎 ≠ 𝑏 ∧ 𝜒 ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 ((𝑥 ≠ 𝑦 ∧ 𝜃) → {𝑥, 𝑦} = {𝑎, 𝑏})))) |
| 18 | 17 | 2rexbidv 3203 | . 2 ⊢ (𝑋 ∈ 𝑉 → (∃𝑎 ∈ 𝑋 ∃𝑏 ∈ 𝑋 ((𝑎 ≠ 𝑏 ∧ 𝜒) ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 ((𝑥 ≠ 𝑦 ∧ 𝜃) → {𝑥, 𝑦} = {𝑎, 𝑏})) ↔ ∃𝑎 ∈ 𝑋 ∃𝑏 ∈ 𝑋 (𝑎 ≠ 𝑏 ∧ 𝜒 ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 ((𝑥 ≠ 𝑦 ∧ 𝜃) → {𝑥, 𝑦} = {𝑎, 𝑏})))) |
| 19 | 1, 14, 18 | 3bitrd 305 | 1 ⊢ (𝑋 ∈ 𝑉 → (∃!𝑝 ∈ (Pairsproper‘𝑋)𝜓 ↔ ∃𝑎 ∈ 𝑋 ∃𝑏 ∈ 𝑋 (𝑎 ≠ 𝑏 ∧ 𝜒 ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 ((𝑥 ≠ 𝑦 ∧ 𝜃) → {𝑥, 𝑦} = {𝑎, 𝑏})))) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1087 = wceq 1542 ∈ wcel 2114 ≠ wne 2933 ∀wral 3052 ∃wrex 3062 ∃!wreu 3350 Vcvv 3442 {cpr 4584 ‘cfv 6502 2c2 12214 ♯chash 14267 Pairscspr 47866 Pairspropercprpr 47901 |
| 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 5245 ax-nul 5255 ax-pow 5314 ax-pr 5381 ax-un 7692 ax-cnex 11096 ax-resscn 11097 ax-1cn 11098 ax-icn 11099 ax-addcl 11100 ax-addrcl 11101 ax-mulcl 11102 ax-mulrcl 11103 ax-mulcom 11104 ax-addass 11105 ax-mulass 11106 ax-distr 11107 ax-i2m1 11108 ax-1ne0 11109 ax-1rid 11110 ax-rnegex 11111 ax-rrecex 11112 ax-cnre 11113 ax-pre-lttri 11114 ax-pre-lttrn 11115 ax-pre-ltadd 11116 ax-pre-mulgt0 11117 |
| 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-nel 3038 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 5529 df-eprel 5534 df-po 5542 df-so 5543 df-fr 5587 df-we 5589 df-xp 5640 df-rel 5641 df-cnv 5642 df-co 5643 df-dm 5644 df-rn 5645 df-res 5646 df-ima 5647 df-pred 6269 df-ord 6330 df-on 6331 df-lim 6332 df-suc 6333 df-iota 6458 df-fun 6504 df-fn 6505 df-f 6506 df-f1 6507 df-fo 6508 df-f1o 6509 df-fv 6510 df-riota 7327 df-ov 7373 df-oprab 7374 df-mpo 7375 df-om 7821 df-1st 7945 df-2nd 7946 df-frecs 8235 df-wrecs 8266 df-recs 8315 df-rdg 8353 df-1o 8409 df-oadd 8413 df-er 8647 df-en 8898 df-dom 8899 df-sdom 8900 df-fin 8901 df-dju 9827 df-card 9865 df-pnf 11182 df-mnf 11183 df-xr 11184 df-ltxr 11185 df-le 11186 df-sub 11380 df-neg 11381 df-nn 12160 df-2 12222 df-n0 12416 df-z 12503 df-uz 12766 df-fz 13438 df-hash 14268 df-spr 47867 df-prpr 47902 |
| This theorem is referenced by: (None) |
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