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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 12733 | . . . 4 ⊢ 1 ∈ ℤ | |
| 2 | en2sn 9076 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 1 ∈ ℤ) → {𝐴} ≈ {1}) | |
| 3 | 1, 2 | mpan2 704 | . . 3 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≈ {1}) |
| 4 | snfi 9078 | . . . 4 ⊢ {𝐴} ∈ Fin | |
| 5 | snfi 9078 | . . . 4 ⊢ {1} ∈ Fin | |
| 6 | hashen 14498 | . . . 4 ⊢ (({𝐴} ∈ Fin ∧ {1} ∈ Fin) → ((♯‘{𝐴}) = (♯‘{1}) ↔ {𝐴} ≈ {1})) | |
| 7 | 4, 5, 6 | mp2an 705 | . . 3 ⊢ ((♯‘{𝐴}) = (♯‘{1}) ↔ {𝐴} ≈ {1}) |
| 8 | 3, 7 | sylibr 237 | . 2 ⊢ (𝐴 ∈ 𝑉 → (♯‘{𝐴}) = (♯‘{1})) |
| 9 | fzsn 13707 | . . . . 5 ⊢ (1 ∈ ℤ → (1...1) = {1}) | |
| 10 | 9 | fveq2d 6894 | . . . 4 ⊢ (1 ∈ ℤ → (♯‘(1...1)) = (♯‘{1})) |
| 11 | 1nn0 12629 | . . . . 5 ⊢ 1 ∈ ℕ0 | |
| 12 | hashfz1 14497 | . . . . 5 ⊢ (1 ∈ ℕ0 → (♯‘(1...1)) = 1) | |
| 13 | 11, 12 | ax-mp 5 | . . . 4 ⊢ (♯‘(1...1)) = 1 |
| 14 | 10, 13 | eqtr3di 2810 | . . 3 ⊢ (1 ∈ ℤ → (♯‘{1}) = 1) |
| 15 | 1, 14 | ax-mp 5 | . 2 ⊢ (♯‘{1}) = 1 |
| 16 | 8, 15 | eqtrdi 2811 | 1 ⊢ (𝐴 ∈ 𝑉 → (♯‘{𝐴}) = 1) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 = wceq 1569 ∈ wcel 2144 {csn 4584 class class class wbr 5102 ‘cfv 6543 (class class class)co 7424 ≈ cen 8977 Fincfn 8980 1c1 11208 ℕ0cn0 12613 ℤcz 12700 ...cfz 13646 ♯chash 14481 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5327 ax-pr 5391 ax-un 7755 ax-cnex 11263 ax-resscn 11264 ax-1cn 11265 ax-icn 11266 ax-addcl 11267 ax-addrcl 11268 ax-mulcl 11269 ax-mulrcl 11270 ax-mulcom 11271 ax-addass 11272 ax-mulass 11273 ax-distr 11274 ax-i2m1 11275 ax-1ne0 11276 ax-1rid 11277 ax-rnegex 11278 ax-rrecex 11279 ax-cnre 11280 ax-pre-lttri 11281 ax-pre-lttrn 11282 ax-pre-ltadd 11283 ax-pre-mulgt0 11284 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3848 df-ss 3897 df-pss 4013 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-int 4907 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6307 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6497 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7381 df-ov 7427 df-oprab 7428 df-mpo 7429 df-om 7882 df-1st 8005 df-2nd 8006 df-frecs 8306 df-wrecs 8337 df-recs 8386 df-rdg 8425 df-1o 8483 df-er 8724 df-en 8981 df-dom 8982 df-sdom 8983 df-fin 8984 df-card 10027 df-pnf 11352 df-mnf 11353 df-xr 11354 df-ltxr 11355 df-le 11356 df-sub 11550 df-neg 11551 df-nn 12343 df-n0 12614 df-z 12701 df-uz 12973 df-fz 13647 df-hash 14482 |
| This theorem is used by: hashen1 14521 hashrabrsn 14523 hashrabsn01 14524 hashunsng 14543 hashunsngx 14544 hashprg 14546 elprchashprn2 14547 hashdifsn 14566 hashsn01 14568 hash1snb 14571 hashmap 14587 hashfun 14589 hashbclem 14604 hashbc 14605 hashf1 14609 hash2prde 14622 hash2pwpr 14628 hashge2el2dif 14632 hash7g 14638 hash3tpexb 14646 hashdifsnp1 14658 s1len 14760 ackbijnn 16006 phicl2 16954 dfphi2 16960 vdwlem8 17175 ramcl 17216 cshwshashnsame 17290 efmnd1hash 19097 symg1hash 19613 pgp0 19819 odcau 19827 sylow2a 19842 sylow3lem6 19855 prmcyg 20117 gsumsnfd 20174 ablfac1eulem 20297 ablfac1eu 20298 pgpfaclem2 20307 prmgrpsimpgd 20339 ablsimpgprmd 20340 c0snmhm 20702 0ringdif 20787 0ring01eqbi2 20792 0ring01eqbi 20793 rng1nnzr 21042 prmidl0 21643 qsidomlem1 21645 fta1glem2 26496 fta1blem 26498 fta1lem 26637 vieta1lem2 26643 vieta1 26644 vmappw 27452 umgredgnlp 29734 lfuhgr1v0e 29844 usgr1vr 29845 uvtxnm1nbgr 29994 1hevtxdg1 30096 1egrvtxdg1 30099 lfgrwlkprop 30279 rusgrnumwwlkb0 30572 clwwlknon1le1 30701 eupth2eucrct 30827 fusgreghash2wspv 30945 numclwlk1lem1 30979 ex-hash 31063 0ringsubrg 33862 drngidlhash 34033 krull 34053 qsdrng 34071 esplyfval1 34255 rlmdim 34292 lsatdim 34299 zarcmplem 34563 esumcst 34745 cntnevol 34911 coinflippv 35166 ccatmulgnn0dir 35224 ofcccat 35225 lpadlem2 35362 derang0 36024 poimirlem26 38673 poimirlem27 38674 poimirlem28 38675 frlmvscadiccat 43682 |
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