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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 11310 | . . . . 5 ⊢ 3 ∈ ℕ0 | |
2 | hashvnfin 13151 | . . . . 5 ⊢ ((𝑉 ∈ 𝑊 ∧ 3 ∈ ℕ0) → ((#‘𝑉) = 3 → 𝑉 ∈ Fin)) | |
3 | 1, 2 | mpan2 707 | . . . 4 ⊢ (𝑉 ∈ 𝑊 → ((#‘𝑉) = 3 → 𝑉 ∈ Fin)) |
4 | 3 | imp 445 | . . 3 ⊢ ((𝑉 ∈ 𝑊 ∧ (#‘𝑉) = 3) → 𝑉 ∈ Fin) |
5 | hash3 13194 | . . . . . . . 8 ⊢ (#‘3𝑜) = 3 | |
6 | 5 | eqcomi 2631 | . . . . . . 7 ⊢ 3 = (#‘3𝑜) |
7 | 6 | a1i 11 | . . . . . 6 ⊢ (𝑉 ∈ Fin → 3 = (#‘3𝑜)) |
8 | 7 | eqeq2d 2632 | . . . . 5 ⊢ (𝑉 ∈ Fin → ((#‘𝑉) = 3 ↔ (#‘𝑉) = (#‘3𝑜))) |
9 | 3onn 7721 | . . . . . . . 8 ⊢ 3𝑜 ∈ ω | |
10 | nnfi 8153 | . . . . . . . 8 ⊢ (3𝑜 ∈ ω → 3𝑜 ∈ Fin) | |
11 | 9, 10 | ax-mp 5 | . . . . . . 7 ⊢ 3𝑜 ∈ Fin |
12 | hashen 13135 | . . . . . . 7 ⊢ ((𝑉 ∈ Fin ∧ 3𝑜 ∈ Fin) → ((#‘𝑉) = (#‘3𝑜) ↔ 𝑉 ≈ 3𝑜)) | |
13 | 11, 12 | mpan2 707 | . . . . . 6 ⊢ (𝑉 ∈ Fin → ((#‘𝑉) = (#‘3𝑜) ↔ 𝑉 ≈ 3𝑜)) |
14 | 13 | biimpd 219 | . . . . 5 ⊢ (𝑉 ∈ Fin → ((#‘𝑉) = (#‘3𝑜) → 𝑉 ≈ 3𝑜)) |
15 | 8, 14 | sylbid 230 | . . . 4 ⊢ (𝑉 ∈ Fin → ((#‘𝑉) = 3 → 𝑉 ≈ 3𝑜)) |
16 | 15 | adantld 483 | . . 3 ⊢ (𝑉 ∈ Fin → ((𝑉 ∈ 𝑊 ∧ (#‘𝑉) = 3) → 𝑉 ≈ 3𝑜)) |
17 | 4, 16 | mpcom 38 | . 2 ⊢ ((𝑉 ∈ 𝑊 ∧ (#‘𝑉) = 3) → 𝑉 ≈ 3𝑜) |
18 | en3 8197 | . 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 196 ∧ wa 384 = wceq 1483 ∃wex 1704 ∈ wcel 1990 {ctp 4181 class class class wbr 4653 ‘cfv 5888 ωcom 7065 3𝑜c3o 7555 ≈ cen 7952 Fincfn 7955 3c3 11071 ℕ0cn0 11292 #chash 13117 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-rep 4771 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 ax-cnex 9992 ax-resscn 9993 ax-1cn 9994 ax-icn 9995 ax-addcl 9996 ax-addrcl 9997 ax-mulcl 9998 ax-mulrcl 9999 ax-mulcom 10000 ax-addass 10001 ax-mulass 10002 ax-distr 10003 ax-i2m1 10004 ax-1ne0 10005 ax-1rid 10006 ax-rnegex 10007 ax-rrecex 10008 ax-cnre 10009 ax-pre-lttri 10010 ax-pre-lttrn 10011 ax-pre-ltadd 10012 ax-pre-mulgt0 10013 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3or 1038 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-nel 2898 df-ral 2917 df-rex 2918 df-reu 2919 df-rmo 2920 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-pss 3590 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-tp 4182 df-op 4184 df-uni 4437 df-int 4476 df-iun 4522 df-br 4654 df-opab 4713 df-mpt 4730 df-tr 4753 df-id 5024 df-eprel 5029 df-po 5035 df-so 5036 df-fr 5073 df-we 5075 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-pred 5680 df-ord 5726 df-on 5727 df-lim 5728 df-suc 5729 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-riota 6611 df-ov 6653 df-oprab 6654 df-mpt2 6655 df-om 7066 df-1st 7168 df-2nd 7169 df-wrecs 7407 df-recs 7468 df-rdg 7506 df-1o 7560 df-2o 7561 df-3o 7562 df-oadd 7564 df-er 7742 df-en 7956 df-dom 7957 df-sdom 7958 df-fin 7959 df-card 8765 df-cda 8990 df-pnf 10076 df-mnf 10077 df-xr 10078 df-ltxr 10079 df-le 10080 df-sub 10268 df-neg 10269 df-nn 11021 df-2 11079 df-3 11080 df-n0 11293 df-z 11378 df-uz 11688 df-fz 12327 df-hash 13118 |
This theorem is referenced by: hash1to3 13273 |
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