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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 14503 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) → 𝐹:(0..^3)–onto→𝑇) |
| 4 | 3 | adantr 483 | . 2 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) ∧ (♯‘𝑇) = 3) → 𝐹:(0..^3)–onto→𝑇) |
| 5 | 3nn0 12489 | . . . . 5 ⊢ 3 ∈ ℕ0 | |
| 6 | hashfzo0 14433 | . . . . 5 ⊢ (3 ∈ ℕ0 → (♯‘(0..^3)) = 3) | |
| 7 | 5, 6 | ax-mp 5 | . . . 4 ⊢ (♯‘(0..^3)) = 3 |
| 8 | eqcom 2763 | . . . . 5 ⊢ ((♯‘𝑇) = 3 ↔ 3 = (♯‘𝑇)) | |
| 9 | 8 | bilani 507 | . . . 4 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) ∧ (♯‘𝑇) = 3) → 3 = (♯‘𝑇)) |
| 10 | 7, 9 | eqtrid 2803 | . . 3 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) ∧ (♯‘𝑇) = 3) → (♯‘(0..^3)) = (♯‘𝑇)) |
| 11 | fzofi 13977 | . . . . 5 ⊢ (0..^3) ∈ Fin | |
| 12 | 11 | a1i 11 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) → (0..^3) ∈ Fin) |
| 13 | tpfi 9259 | . . . . . 6 ⊢ {𝐴, 𝐵, 𝐶} ∈ Fin | |
| 14 | 2, 13 | eqeltri 2852 | . . . . 5 ⊢ 𝑇 ∈ Fin |
| 15 | 14 | a1i 11 | . . . 4 ⊢ ((♯‘𝑇) = 3 → 𝑇 ∈ Fin) |
| 16 | hashen 14350 | . . . 4 ⊢ (((0..^3) ∈ Fin ∧ 𝑇 ∈ Fin) → ((♯‘(0..^3)) = (♯‘𝑇) ↔ (0..^3) ≈ 𝑇)) | |
| 17 | 12, 15, 16 | syl2an 604 | . . 3 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) ∧ (♯‘𝑇) = 3) → ((♯‘(0..^3)) = (♯‘𝑇) ↔ (0..^3) ≈ 𝑇)) |
| 18 | 10, 17 | mpbid 234 | . 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 9265 | . 2 ⊢ ((𝐹:(0..^3)–onto→𝑇 ∧ (0..^3) ≈ 𝑇 ∧ 𝑇 ∈ Fin) → 𝐹:(0..^3)–1-1-onto→𝑇) | |
| 21 | 4, 18, 19, 20 | syl3anc 1386 | 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 208 ∧ wa 398 ∧ w3a 1095 = wceq 1554 ∈ wcel 2136 ifcif 4474 {ctp 4580 class class class wbr 5094 ↦ cmpt 5175 –onto→wfo 6508 –1-1-onto→wf1o 6509 ‘cfv 6510 (class class class)co 7385 ≈ cen 8913 Fincfn 8916 0cc0 11063 1c1 11064 3c3 12263 ℕ0cn0 12471 ..^cfzo 13649 ♯chash 14333 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1809 ax-4 1823 ax-5 1924 ax-6 1981 ax-7 2022 ax-8 2138 ax-9 2146 ax-10 2169 ax-11 2185 ax-12 2206 ax-ext 2728 ax-sep 5240 ax-nul 5250 ax-pow 5316 ax-pr 5384 ax-un 7707 ax-cnex 11119 ax-resscn 11120 ax-1cn 11121 ax-icn 11122 ax-addcl 11123 ax-addrcl 11124 ax-mulcl 11125 ax-mulrcl 11126 ax-mulcom 11127 ax-addass 11128 ax-mulass 11129 ax-distr 11130 ax-i2m1 11131 ax-1ne0 11132 ax-1rid 11133 ax-rnegex 11134 ax-rrecex 11135 ax-cnre 11136 ax-pre-lttri 11137 ax-pre-lttrn 11138 ax-pre-ltadd 11139 ax-pre-mulgt0 11140 |
| This theorem depends on definitions: df-bi 209 df-an 399 df-or 857 df-3or 1096 df-3an 1097 df-tru 1557 df-fal 1567 df-ex 1794 df-nf 1798 df-sb 2085 df-mo 2560 df-eu 2590 df-clab 2735 df-cleq 2748 df-clel 2831 df-nfc 2905 df-ne 2952 df-nel 3056 df-ral 3071 df-rex 3081 df-reu 3362 df-rab 3409 df-v 3450 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4281 df-if 4475 df-pw 4551 df-sn 4577 df-pr 4579 df-tp 4581 df-op 4583 df-uni 4860 df-int 4900 df-iun 4945 df-br 5095 df-opab 5157 df-mpt 5176 df-tr 5202 df-id 5535 df-eprel 5540 df-po 5548 df-so 5549 df-fr 5593 df-we 5595 df-xp 5646 df-rel 5647 df-cnv 5648 df-co 5649 df-dm 5650 df-rn 5651 df-res 5652 df-ima 5653 df-pred 6277 df-ord 6338 df-on 6339 df-lim 6340 df-suc 6341 df-iota 6466 df-fun 6512 df-fn 6513 df-f 6514 df-f1 6515 df-fo 6516 df-f1o 6517 df-fv 6518 df-riota 7342 df-ov 7388 df-oprab 7389 df-mpo 7390 df-om 7836 df-1st 7959 df-2nd 7960 df-frecs 8250 df-wrecs 8281 df-recs 8330 df-rdg 8369 df-1o 8425 df-2o 8426 df-er 8666 df-en 8917 df-dom 8918 df-sdom 8919 df-fin 8920 df-card 9887 df-pnf 11208 df-mnf 11209 df-xr 11210 df-ltxr 11211 df-le 11212 df-sub 11406 df-neg 11407 df-nn 12201 df-2 12270 df-3 12271 df-n0 12472 df-z 12559 df-uz 12830 df-fz 13503 df-fzo 13650 df-hash 14334 |
| This theorem is referenced by: isgrtri 48513 |
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