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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 48006 | . 2 ⊢ (𝑋 ∈ 𝑉 → (∃!𝑝 ∈ (Pairsproper‘𝑋)𝜓 ↔ ∃!𝑝 ∈ (Pairs‘𝑋)((♯‘𝑝) = 2 ∧ 𝜓))) | |
| 2 | fveqeq2 6839 | . . . . 5 ⊢ (𝑝 = {𝑎, 𝑏} → ((♯‘𝑝) = 2 ↔ (♯‘{𝑎, 𝑏}) = 2)) | |
| 3 | hashprg 14352 | . . . . . 6 ⊢ ((𝑎 ∈ V ∧ 𝑏 ∈ V) → (𝑎 ≠ 𝑏 ↔ (♯‘{𝑎, 𝑏}) = 2)) | |
| 4 | 3 | el2v 3440 | . . . . 5 ⊢ (𝑎 ≠ 𝑏 ↔ (♯‘{𝑎, 𝑏}) = 2) |
| 5 | 2, 4 | bitr4di 291 | . . . 4 ⊢ (𝑝 = {𝑎, 𝑏} → ((♯‘𝑝) = 2 ↔ 𝑎 ≠ 𝑏)) |
| 6 | reupr.a | . . . 4 ⊢ (𝑝 = {𝑎, 𝑏} → (𝜓 ↔ 𝜒)) | |
| 7 | 5, 6 | anbi12d 639 | . . 3 ⊢ (𝑝 = {𝑎, 𝑏} → (((♯‘𝑝) = 2 ∧ 𝜓) ↔ (𝑎 ≠ 𝑏 ∧ 𝜒))) |
| 8 | fveqeq2 6839 | . . . . 5 ⊢ (𝑝 = {𝑥, 𝑦} → ((♯‘𝑝) = 2 ↔ (♯‘{𝑥, 𝑦}) = 2)) | |
| 9 | hashprg 14352 | . . . . . 6 ⊢ ((𝑥 ∈ V ∧ 𝑦 ∈ V) → (𝑥 ≠ 𝑦 ↔ (♯‘{𝑥, 𝑦}) = 2)) | |
| 10 | 9 | el2v 3440 | . . . . 5 ⊢ (𝑥 ≠ 𝑦 ↔ (♯‘{𝑥, 𝑦}) = 2) |
| 11 | 8, 10 | bitr4di 291 | . . . 4 ⊢ (𝑝 = {𝑥, 𝑦} → ((♯‘𝑝) = 2 ↔ 𝑥 ≠ 𝑦)) |
| 12 | reupr.x | . . . 4 ⊢ (𝑝 = {𝑥, 𝑦} → (𝜓 ↔ 𝜃)) | |
| 13 | 11, 12 | anbi12d 639 | . . 3 ⊢ (𝑝 = {𝑥, 𝑦} → (((♯‘𝑝) = 2 ∧ 𝜓) ↔ (𝑥 ≠ 𝑦 ∧ 𝜃))) |
| 14 | 7, 13 | reupr 48009 | . 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 1095 | . . . . 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 226 | . . . 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 3206 | . 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 307 | 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 208 ∧ wa 397 ∧ w3a 1093 = wceq 1548 ∈ wcel 2121 ≠ wne 2936 ∀wral 3055 ∃wrex 3065 ∃!wreu 3344 Vcvv 3433 {cpr 4559 ‘cfv 6488 2c2 12231 ♯chash 14287 Pairscspr 47964 Pairspropercprpr 47999 |
| 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 1975 ax-7 2016 ax-8 2123 ax-9 2131 ax-10 2154 ax-11 2170 ax-12 2191 ax-ext 2713 ax-rep 5201 ax-sep 5220 ax-nul 5230 ax-pow 5296 ax-pr 5364 ax-un 7681 ax-cnex 11090 ax-resscn 11091 ax-1cn 11092 ax-icn 11093 ax-addcl 11094 ax-addrcl 11095 ax-mulcl 11096 ax-mulrcl 11097 ax-mulcom 11098 ax-addass 11099 ax-mulass 11100 ax-distr 11101 ax-i2m1 11102 ax-1ne0 11103 ax-1rid 11104 ax-rnegex 11105 ax-rrecex 11106 ax-cnre 11107 ax-pre-lttri 11108 ax-pre-lttrn 11109 ax-pre-ltadd 11110 ax-pre-mulgt0 11111 |
| This theorem depends on definitions: df-bi 209 df-an 398 df-or 855 df-3or 1094 df-3an 1095 df-tru 1551 df-fal 1561 df-ex 1788 df-nf 1792 df-sb 2075 df-mo 2545 df-eu 2575 df-clab 2720 df-cleq 2733 df-clel 2816 df-nfc 2890 df-ne 2937 df-nel 3041 df-ral 3056 df-rex 3066 df-rmo 3346 df-reu 3347 df-rab 3394 df-v 3435 df-sbc 3725 df-csb 3833 df-dif 3887 df-un 3889 df-in 3891 df-ss 3901 df-pss 3904 df-nul 4264 df-if 4457 df-pw 4533 df-sn 4558 df-pr 4560 df-op 4564 df-uni 4841 df-int 4880 df-iun 4925 df-br 5075 df-opab 5137 df-mpt 5156 df-tr 5182 df-id 5515 df-eprel 5520 df-po 5528 df-so 5529 df-fr 5573 df-we 5575 df-xp 5626 df-rel 5627 df-cnv 5628 df-co 5629 df-dm 5630 df-rn 5631 df-res 5632 df-ima 5633 df-pred 6255 df-ord 6316 df-on 6317 df-lim 6318 df-suc 6319 df-iota 6444 df-fun 6490 df-fn 6491 df-f 6492 df-f1 6493 df-fo 6494 df-f1o 6495 df-fv 6496 df-riota 7316 df-ov 7362 df-oprab 7363 df-mpo 7364 df-om 7810 df-1st 7933 df-2nd 7934 df-frecs 8224 df-wrecs 8255 df-recs 8304 df-rdg 8343 df-1o 8399 df-oadd 8403 df-er 8637 df-en 8888 df-dom 8889 df-sdom 8890 df-fin 8891 df-dju 9820 df-card 9858 df-pnf 11177 df-mnf 11178 df-xr 11179 df-ltxr 11180 df-le 11181 df-sub 11375 df-neg 11376 df-nn 12170 df-2 12239 df-n0 12433 df-z 12520 df-uz 12784 df-fz 13457 df-hash 14288 df-spr 47965 df-prpr 48000 |
| This theorem is referenced by: (None) |
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