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Mirrors > Home > MPE Home > Th. List > hash3tr | Structured version Visualization version GIF version |
Description: A set of size three is an unordered triple. (Contributed by Alexander van der Vekens, 13-Sep-2018.) |
Ref | Expression |
---|---|
hash3tr | ⊢ ((𝑉 ∈ 𝑊 ∧ (♯‘𝑉) = 3) → ∃𝑎∃𝑏∃𝑐 𝑉 = {𝑎, 𝑏, 𝑐}) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3nn0 11966 | . . . . 5 ⊢ 3 ∈ ℕ0 | |
2 | hashvnfin 13785 | . . . . 5 ⊢ ((𝑉 ∈ 𝑊 ∧ 3 ∈ ℕ0) → ((♯‘𝑉) = 3 → 𝑉 ∈ Fin)) | |
3 | 1, 2 | mpan2 690 | . . . 4 ⊢ (𝑉 ∈ 𝑊 → ((♯‘𝑉) = 3 → 𝑉 ∈ Fin)) |
4 | 3 | imp 410 | . . 3 ⊢ ((𝑉 ∈ 𝑊 ∧ (♯‘𝑉) = 3) → 𝑉 ∈ Fin) |
5 | hash3 13831 | . . . . . . . 8 ⊢ (♯‘3o) = 3 | |
6 | 5 | eqcomi 2768 | . . . . . . 7 ⊢ 3 = (♯‘3o) |
7 | 6 | a1i 11 | . . . . . 6 ⊢ (𝑉 ∈ Fin → 3 = (♯‘3o)) |
8 | 7 | eqeq2d 2770 | . . . . 5 ⊢ (𝑉 ∈ Fin → ((♯‘𝑉) = 3 ↔ (♯‘𝑉) = (♯‘3o))) |
9 | 3onn 8284 | . . . . . . . 8 ⊢ 3o ∈ ω | |
10 | nnfi 8764 | . . . . . . . 8 ⊢ (3o ∈ ω → 3o ∈ Fin) | |
11 | 9, 10 | ax-mp 5 | . . . . . . 7 ⊢ 3o ∈ Fin |
12 | hashen 13771 | . . . . . . 7 ⊢ ((𝑉 ∈ Fin ∧ 3o ∈ Fin) → ((♯‘𝑉) = (♯‘3o) ↔ 𝑉 ≈ 3o)) | |
13 | 11, 12 | mpan2 690 | . . . . . 6 ⊢ (𝑉 ∈ Fin → ((♯‘𝑉) = (♯‘3o) ↔ 𝑉 ≈ 3o)) |
14 | 13 | biimpd 232 | . . . . 5 ⊢ (𝑉 ∈ Fin → ((♯‘𝑉) = (♯‘3o) → 𝑉 ≈ 3o)) |
15 | 8, 14 | sylbid 243 | . . . 4 ⊢ (𝑉 ∈ Fin → ((♯‘𝑉) = 3 → 𝑉 ≈ 3o)) |
16 | 15 | adantld 494 | . . 3 ⊢ (𝑉 ∈ Fin → ((𝑉 ∈ 𝑊 ∧ (♯‘𝑉) = 3) → 𝑉 ≈ 3o)) |
17 | 4, 16 | mpcom 38 | . 2 ⊢ ((𝑉 ∈ 𝑊 ∧ (♯‘𝑉) = 3) → 𝑉 ≈ 3o) |
18 | en3 8805 | . 2 ⊢ (𝑉 ≈ 3o → ∃𝑎∃𝑏∃𝑐 𝑉 = {𝑎, 𝑏, 𝑐}) | |
19 | 17, 18 | syl 17 | 1 ⊢ ((𝑉 ∈ 𝑊 ∧ (♯‘𝑉) = 3) → ∃𝑎∃𝑏∃𝑐 𝑉 = {𝑎, 𝑏, 𝑐}) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 = wceq 1539 ∃wex 1782 ∈ wcel 2112 {ctp 4530 class class class wbr 5037 ‘cfv 6341 ωcom 7586 3oc3o 8114 ≈ cen 8538 Fincfn 8541 3c3 11744 ℕ0cn0 11948 ♯chash 13754 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1912 ax-6 1971 ax-7 2016 ax-8 2114 ax-9 2122 ax-10 2143 ax-11 2159 ax-12 2176 ax-ext 2730 ax-sep 5174 ax-nul 5181 ax-pow 5239 ax-pr 5303 ax-un 7466 ax-cnex 10645 ax-resscn 10646 ax-1cn 10647 ax-icn 10648 ax-addcl 10649 ax-addrcl 10650 ax-mulcl 10651 ax-mulrcl 10652 ax-mulcom 10653 ax-addass 10654 ax-mulass 10655 ax-distr 10656 ax-i2m1 10657 ax-1ne0 10658 ax-1rid 10659 ax-rnegex 10660 ax-rrecex 10661 ax-cnre 10662 ax-pre-lttri 10663 ax-pre-lttrn 10664 ax-pre-ltadd 10665 ax-pre-mulgt0 10666 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2071 df-mo 2558 df-eu 2589 df-clab 2737 df-cleq 2751 df-clel 2831 df-nfc 2902 df-ne 2953 df-nel 3057 df-ral 3076 df-rex 3077 df-reu 3078 df-rab 3080 df-v 3412 df-sbc 3700 df-csb 3809 df-dif 3864 df-un 3866 df-in 3868 df-ss 3878 df-pss 3880 df-nul 4229 df-if 4425 df-pw 4500 df-sn 4527 df-pr 4529 df-tp 4531 df-op 4533 df-uni 4803 df-int 4843 df-iun 4889 df-br 5038 df-opab 5100 df-mpt 5118 df-tr 5144 df-id 5435 df-eprel 5440 df-po 5448 df-so 5449 df-fr 5488 df-we 5490 df-xp 5535 df-rel 5536 df-cnv 5537 df-co 5538 df-dm 5539 df-rn 5540 df-res 5541 df-ima 5542 df-pred 6132 df-ord 6178 df-on 6179 df-lim 6180 df-suc 6181 df-iota 6300 df-fun 6343 df-fn 6344 df-f 6345 df-f1 6346 df-fo 6347 df-f1o 6348 df-fv 6349 df-riota 7115 df-ov 7160 df-oprab 7161 df-mpo 7162 df-om 7587 df-1st 7700 df-2nd 7701 df-wrecs 7964 df-recs 8025 df-rdg 8063 df-1o 8119 df-2o 8120 df-3o 8121 df-oadd 8123 df-er 8306 df-en 8542 df-dom 8543 df-sdom 8544 df-fin 8545 df-dju 9377 df-card 9415 df-pnf 10729 df-mnf 10730 df-xr 10731 df-ltxr 10732 df-le 10733 df-sub 10924 df-neg 10925 df-nn 11689 df-2 11751 df-3 11752 df-n0 11949 df-z 12035 df-uz 12297 df-fz 12954 df-hash 13755 |
This theorem is referenced by: hash1to3 13915 |
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