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| Mirrors > Home > MPE Home > Th. List > hashsng | Structured version Visualization version GIF version | ||
| Description: The size of a singleton. (Contributed by Paul Chapman, 26-Oct-2012.) (Proof shortened by Mario Carneiro, 13-Feb-2013.) |
| Ref | Expression |
|---|---|
| hashsng | ⊢ (𝐴 ∈ 𝑉 → (♯‘{𝐴}) = 1) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1z 12548 | . . . 4 ⊢ 1 ∈ ℤ | |
| 2 | en2sn 8981 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 1 ∈ ℤ) → {𝐴} ≈ {1}) | |
| 3 | 1, 2 | mpan2 692 | . . 3 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≈ {1}) |
| 4 | snfi 8983 | . . . 4 ⊢ {𝐴} ∈ Fin | |
| 5 | snfi 8983 | . . . 4 ⊢ {1} ∈ Fin | |
| 6 | hashen 14300 | . . . 4 ⊢ (({𝐴} ∈ Fin ∧ {1} ∈ Fin) → ((♯‘{𝐴}) = (♯‘{1}) ↔ {𝐴} ≈ {1})) | |
| 7 | 4, 5, 6 | mp2an 693 | . . 3 ⊢ ((♯‘{𝐴}) = (♯‘{1}) ↔ {𝐴} ≈ {1}) |
| 8 | 3, 7 | sylibr 234 | . 2 ⊢ (𝐴 ∈ 𝑉 → (♯‘{𝐴}) = (♯‘{1})) |
| 9 | fzsn 13511 | . . . . 5 ⊢ (1 ∈ ℤ → (1...1) = {1}) | |
| 10 | 9 | fveq2d 6838 | . . . 4 ⊢ (1 ∈ ℤ → (♯‘(1...1)) = (♯‘{1})) |
| 11 | 1nn0 12444 | . . . . 5 ⊢ 1 ∈ ℕ0 | |
| 12 | hashfz1 14299 | . . . . 5 ⊢ (1 ∈ ℕ0 → (♯‘(1...1)) = 1) | |
| 13 | 11, 12 | ax-mp 5 | . . . 4 ⊢ (♯‘(1...1)) = 1 |
| 14 | 10, 13 | eqtr3di 2787 | . . 3 ⊢ (1 ∈ ℤ → (♯‘{1}) = 1) |
| 15 | 1, 14 | ax-mp 5 | . 2 ⊢ (♯‘{1}) = 1 |
| 16 | 8, 15 | eqtrdi 2788 | 1 ⊢ (𝐴 ∈ 𝑉 → (♯‘{𝐴}) = 1) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 = wceq 1542 ∈ wcel 2114 {csn 4568 class class class wbr 5086 ‘cfv 6492 (class class class)co 7360 ≈ cen 8883 Fincfn 8886 1c1 11030 ℕ0cn0 12428 ℤcz 12515 ...cfz 13452 ♯chash 14283 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5231 ax-nul 5241 ax-pow 5302 ax-pr 5370 ax-un 7682 ax-cnex 11085 ax-resscn 11086 ax-1cn 11087 ax-icn 11088 ax-addcl 11089 ax-addrcl 11090 ax-mulcl 11091 ax-mulrcl 11092 ax-mulcom 11093 ax-addass 11094 ax-mulass 11095 ax-distr 11096 ax-i2m1 11097 ax-1ne0 11098 ax-1rid 11099 ax-rnegex 11100 ax-rrecex 11101 ax-cnre 11102 ax-pre-lttri 11103 ax-pre-lttrn 11104 ax-pre-ltadd 11105 ax-pre-mulgt0 11106 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-int 4891 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5519 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7317 df-ov 7363 df-oprab 7364 df-mpo 7365 df-om 7811 df-1st 7935 df-2nd 7936 df-frecs 8224 df-wrecs 8255 df-recs 8304 df-rdg 8342 df-1o 8398 df-er 8636 df-en 8887 df-dom 8888 df-sdom 8889 df-fin 8890 df-card 9854 df-pnf 11172 df-mnf 11173 df-xr 11174 df-ltxr 11175 df-le 11176 df-sub 11370 df-neg 11371 df-nn 12166 df-n0 12429 df-z 12516 df-uz 12780 df-fz 13453 df-hash 14284 |
| This theorem is referenced by: hashen1 14323 hashrabrsn 14325 hashrabsn01 14326 hashunsng 14345 hashunsngx 14346 hashprg 14348 elprchashprn2 14349 hashdifsn 14367 hashsn01 14369 hash1snb 14372 hashmap 14388 hashfun 14390 hashbclem 14405 hashbc 14406 hashf1 14410 hash2prde 14423 hash2pwpr 14429 hashge2el2dif 14433 hash7g 14439 hash3tpexb 14447 hashdifsnp1 14459 s1len 14560 ackbijnn 15784 phicl2 16729 dfphi2 16735 vdwlem8 16950 ramcl 16991 cshwshashnsame 17065 efmnd1hash 18851 symg1hash 19356 pgp0 19562 odcau 19570 sylow2a 19585 sylow3lem6 19598 prmcyg 19860 gsumsnfd 19917 ablfac1eulem 20040 ablfac1eu 20041 pgpfaclem2 20050 prmgrpsimpgd 20082 ablsimpgprmd 20083 c0snmhm 20434 0ringdif 20495 0ring01eqbi 20500 rng1nnzr 20743 fta1glem2 26144 fta1blem 26146 fta1lem 26284 vieta1lem2 26288 vieta1 26289 vmappw 27093 umgredgnlp 29230 lfuhgr1v0e 29337 usgr1vr 29338 uvtxnm1nbgr 29487 1hevtxdg1 29590 1egrvtxdg1 29593 lfgrwlkprop 29769 rusgrnumwwlkb0 30057 clwwlknon1le1 30186 eupth2eucrct 30302 fusgreghash2wspv 30420 numclwlk1lem1 30454 ex-hash 30538 0ringsubrg 33327 drngidlhash 33509 prmidl0 33525 qsidomlem1 33527 krull 33554 qsdrng 33572 esplyfval1 33732 rlmdim 33769 rgmoddimOLD 33770 lsatdim 33777 zarcmplem 34041 esumcst 34223 cntnevol 34388 coinflippv 34644 ccatmulgnn0dir 34702 ofcccat 34703 lpadlem2 34840 derang0 35367 poimirlem26 37981 poimirlem27 37982 poimirlem28 37983 frlmvscadiccat 42965 |
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