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| Mirrors > Home > MPE Home > Th. List > tpf1o | Structured version Visualization version GIF version | ||
| Description: A bijection onto a (proper) triple. (Contributed by AV, 21-Jul-2025.) |
| Ref | Expression |
|---|---|
| tpf1o.f | ⊢ 𝐹 = (𝑥 ∈ (0..^3) ↦ if(𝑥 = 0, 𝐴, if(𝑥 = 1, 𝐵, 𝐶))) |
| tpf.t | ⊢ 𝑇 = {𝐴, 𝐵, 𝐶} |
| Ref | Expression |
|---|---|
| tpf1o | ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) ∧ (♯‘𝑇) = 3) → 𝐹:(0..^3)–1-1-onto→𝑇) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | tpf1o.f | . . . 4 ⊢ 𝐹 = (𝑥 ∈ (0..^3) ↦ if(𝑥 = 0, 𝐴, if(𝑥 = 1, 𝐵, 𝐶))) | |
| 2 | tpf.t | . . . 4 ⊢ 𝑇 = {𝐴, 𝐵, 𝐶} | |
| 3 | 1, 2 | tpfo 14527 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) → 𝐹:(0..^3)–onto→𝑇) |
| 4 | 3 | adantr 485 | . 2 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) ∧ (♯‘𝑇) = 3) → 𝐹:(0..^3)–onto→𝑇) |
| 5 | 3nn0 12513 | . . . . 5 ⊢ 3 ∈ ℕ0 | |
| 6 | hashfzo0 14457 | . . . . 5 ⊢ (3 ∈ ℕ0 → (♯‘(0..^3)) = 3) | |
| 7 | 5, 6 | ax-mp 5 | . . . 4 ⊢ (♯‘(0..^3)) = 3 |
| 8 | eqcom 2772 | . . . . 5 ⊢ ((♯‘𝑇) = 3 ↔ 3 = (♯‘𝑇)) | |
| 9 | 8 | bilani 509 | . . . 4 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) ∧ (♯‘𝑇) = 3) → 3 = (♯‘𝑇)) |
| 10 | 7, 9 | eqtrid 2812 | . . 3 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) ∧ (♯‘𝑇) = 3) → (♯‘(0..^3)) = (♯‘𝑇)) |
| 11 | fzofi 14001 | . . . . 5 ⊢ (0..^3) ∈ Fin | |
| 12 | 11 | a1i 11 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) → (0..^3) ∈ Fin) |
| 13 | tpfi 9273 | . . . . . 6 ⊢ {𝐴, 𝐵, 𝐶} ∈ Fin | |
| 14 | 2, 13 | eqeltri 2861 | . . . . 5 ⊢ 𝑇 ∈ Fin |
| 15 | 14 | a1i 11 | . . . 4 ⊢ ((♯‘𝑇) = 3 → 𝑇 ∈ Fin) |
| 16 | hashen 14374 | . . . 4 ⊢ (((0..^3) ∈ Fin ∧ 𝑇 ∈ Fin) → ((♯‘(0..^3)) = (♯‘𝑇) ↔ (0..^3) ≈ 𝑇)) | |
| 17 | 12, 15, 16 | syl2an 607 | . . 3 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) ∧ (♯‘𝑇) = 3) → ((♯‘(0..^3)) = (♯‘𝑇) ↔ (0..^3) ≈ 𝑇)) |
| 18 | 10, 17 | mpbid 235 | . 2 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) ∧ (♯‘𝑇) = 3) → (0..^3) ≈ 𝑇) |
| 19 | 14 | a1i 11 | . 2 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) ∧ (♯‘𝑇) = 3) → 𝑇 ∈ Fin) |
| 20 | fofinf1o 9277 | . 2 ⊢ ((𝐹:(0..^3)–onto→𝑇 ∧ (0..^3) ≈ 𝑇 ∧ 𝑇 ∈ Fin) → 𝐹:(0..^3)–1-1-onto→𝑇) | |
| 21 | 4, 18, 19, 20 | syl3anc 1394 | 1 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) ∧ (♯‘𝑇) = 3) → 𝐹:(0..^3)–1-1-onto→𝑇) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 209 ∧ wa 400 ∧ w3a 1101 = wceq 1563 ∈ wcel 2145 ifcif 4483 {ctp 4589 class class class wbr 5105 ↦ cmpt 5186 –onto→wfo 6523 –1-1-onto→wf1o 6524 ‘cfv 6525 (class class class)co 7400 ≈ cen 8928 Fincfn 8931 0cc0 11088 1c1 11089 3c3 12287 ℕ0cn0 12495 ..^cfzo 13673 ♯chash 14357 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2737 ax-sep 5251 ax-nul 5261 ax-pow 5327 ax-pr 5395 ax-un 7722 ax-cnex 11144 ax-resscn 11145 ax-1cn 11146 ax-icn 11147 ax-addcl 11148 ax-addrcl 11149 ax-mulcl 11150 ax-mulrcl 11151 ax-mulcom 11152 ax-addass 11153 ax-mulass 11154 ax-distr 11155 ax-i2m1 11156 ax-1ne0 11157 ax-1rid 11158 ax-rnegex 11159 ax-rrecex 11160 ax-cnre 11161 ax-pre-lttri 11162 ax-pre-lttrn 11163 ax-pre-ltadd 11164 ax-pre-mulgt0 11165 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-nf 1807 df-sb 2094 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3065 df-ral 3080 df-rex 3090 df-reu 3371 df-rab 3418 df-v 3459 df-sbc 3748 df-csb 3856 df-dif 3910 df-un 3912 df-in 3914 df-ss 3924 df-pss 3927 df-nul 4289 df-if 4484 df-pw 4560 df-sn 4586 df-pr 4588 df-tp 4590 df-op 4592 df-uni 4869 df-int 4909 df-iun 4954 df-br 5106 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5547 df-eprel 5552 df-po 5560 df-so 5561 df-fr 5605 df-we 5607 df-xp 5658 df-rel 5659 df-cnv 5660 df-co 5661 df-dm 5662 df-rn 5663 df-res 5664 df-ima 5665 df-pred 6292 df-ord 6353 df-on 6354 df-lim 6355 df-suc 6356 df-iota 6481 df-fun 6527 df-fn 6528 df-f 6529 df-f1 6530 df-fo 6531 df-f1o 6532 df-fv 6533 df-riota 7357 df-ov 7403 df-oprab 7404 df-mpo 7405 df-om 7851 df-1st 7974 df-2nd 7975 df-frecs 8266 df-wrecs 8297 df-recs 8346 df-rdg 8385 df-1o 8441 df-2o 8442 df-er 8682 df-en 8932 df-dom 8933 df-sdom 8934 df-fin 8935 df-card 9913 df-pnf 11233 df-mnf 11234 df-xr 11235 df-ltxr 11236 df-le 11237 df-sub 11431 df-neg 11432 df-nn 12225 df-2 12294 df-3 12295 df-n0 12496 df-z 12583 df-uz 12854 df-fz 13527 df-fzo 13674 df-hash 14358 |
| This theorem is referenced by: isgrtri 48563 |
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