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Mirrors > Home > MPE Home > Th. List > hash0 | Structured version Visualization version GIF version |
Description: The empty set has size zero. (Contributed by Mario Carneiro, 8-Jul-2014.) |
Ref | Expression |
---|---|
hash0 | ⊢ (♯‘∅) = 0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2821 | . 2 ⊢ ∅ = ∅ | |
2 | 0ex 5210 | . . 3 ⊢ ∅ ∈ V | |
3 | hasheq0 13723 | . . 3 ⊢ (∅ ∈ V → ((♯‘∅) = 0 ↔ ∅ = ∅)) | |
4 | 2, 3 | ax-mp 5 | . 2 ⊢ ((♯‘∅) = 0 ↔ ∅ = ∅) |
5 | 1, 4 | mpbir 233 | 1 ⊢ (♯‘∅) = 0 |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 208 = wceq 1533 ∈ wcel 2110 Vcvv 3494 ∅c0 4290 ‘cfv 6354 0cc0 10536 ♯chash 13689 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5202 ax-nul 5209 ax-pow 5265 ax-pr 5329 ax-un 7460 ax-cnex 10592 ax-resscn 10593 ax-1cn 10594 ax-icn 10595 ax-addcl 10596 ax-addrcl 10597 ax-mulcl 10598 ax-mulrcl 10599 ax-mulcom 10600 ax-addass 10601 ax-mulass 10602 ax-distr 10603 ax-i2m1 10604 ax-1ne0 10605 ax-1rid 10606 ax-rnegex 10607 ax-rrecex 10608 ax-cnre 10609 ax-pre-lttri 10610 ax-pre-lttrn 10611 ax-pre-ltadd 10612 ax-pre-mulgt0 10613 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-pss 3953 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4567 df-pr 4569 df-tp 4571 df-op 4573 df-uni 4838 df-int 4876 df-iun 4920 df-br 5066 df-opab 5128 df-mpt 5146 df-tr 5172 df-id 5459 df-eprel 5464 df-po 5473 df-so 5474 df-fr 5513 df-we 5515 df-xp 5560 df-rel 5561 df-cnv 5562 df-co 5563 df-dm 5564 df-rn 5565 df-res 5566 df-ima 5567 df-pred 6147 df-ord 6193 df-on 6194 df-lim 6195 df-suc 6196 df-iota 6313 df-fun 6356 df-fn 6357 df-f 6358 df-f1 6359 df-fo 6360 df-f1o 6361 df-fv 6362 df-riota 7113 df-ov 7158 df-oprab 7159 df-mpo 7160 df-om 7580 df-1st 7688 df-2nd 7689 df-wrecs 7946 df-recs 8007 df-rdg 8045 df-1o 8101 df-er 8288 df-en 8509 df-dom 8510 df-sdom 8511 df-fin 8512 df-card 9367 df-pnf 10676 df-mnf 10677 df-xr 10678 df-ltxr 10679 df-le 10680 df-sub 10871 df-neg 10872 df-nn 11638 df-n0 11897 df-z 11981 df-uz 12243 df-fz 12892 df-hash 13690 |
This theorem is referenced by: hashrabrsn 13732 hashrabsn01 13733 hashrabsn1 13734 hashge0 13747 elprchashprn2 13756 hash1 13764 hashsn01 13776 hashgt12el 13782 hashgt12el2 13783 hashfzo 13789 hashfzp1 13791 hashxplem 13793 hashmap 13795 hashbc 13810 hashf1lem2 13813 hashf1 13814 hash2pwpr 13833 wrdnfi 13898 lsw0g 13917 ccatlid 13939 ccatrid 13940 rev0 14125 repswsymballbi 14141 fsumconst 15144 incexclem 15190 incexc 15191 fprodconst 15331 sumodd 15738 hashgcdeq 16125 prmreclem4 16254 prmreclem5 16255 0hashbc 16342 ramz2 16359 cshws0 16434 psgnunilem2 18622 psgnunilem4 18624 psgn0fv0 18638 psgnsn 18647 psgnprfval1 18649 efginvrel2 18852 efgredleme 18868 efgcpbllemb 18880 frgpnabllem1 18992 gsumconst 19053 ltbwe 20252 fta1g 24760 fta1 24896 birthdaylem3 25530 ppi1 25740 musum 25767 rpvmasum 26101 umgrislfupgrlem 26906 lfuhgr1v0e 27035 vtxdg0e 27255 vtxdlfgrval 27266 rusgr1vtxlem 27368 wspn0 27702 rusgrnumwwlkl1 27746 rusgr0edg 27751 clwwlknonel 27873 clwwlknon1le1 27879 0ewlk 27892 0wlk 27894 0wlkon 27898 0pth 27903 0clwlk 27908 0crct 27911 0cycl 27912 eupth0 27992 eulerpathpr 28018 wlkl0 28145 f1ocnt 30524 hashxpe 30528 lvecdim0 31005 esumcst 31322 cntmeas 31485 ballotlemfval0 31753 signsvtn0 31840 signstfvneq0 31842 signstfveq0 31847 signsvf0 31850 lpadright 31955 derangsn 32417 subfacp1lem6 32432 poimirlem25 34916 poimirlem26 34917 poimirlem27 34918 poimirlem28 34919 rp-isfinite6 39882 fzisoeu 41565 |
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