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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 2798 | . 2 ⊢ ∅ = ∅ | |
2 | 0ex 5175 | . . 3 ⊢ ∅ ∈ V | |
3 | hasheq0 13720 | . . 3 ⊢ (∅ ∈ V → ((♯‘∅) = 0 ↔ ∅ = ∅)) | |
4 | 2, 3 | ax-mp 5 | . 2 ⊢ ((♯‘∅) = 0 ↔ ∅ = ∅) |
5 | 1, 4 | mpbir 234 | 1 ⊢ (♯‘∅) = 0 |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 209 = wceq 1538 ∈ wcel 2111 Vcvv 3441 ∅c0 4243 ‘cfv 6324 0cc0 10526 ♯chash 13686 |
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 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pow 5231 ax-pr 5295 ax-un 7441 ax-cnex 10582 ax-resscn 10583 ax-1cn 10584 ax-icn 10585 ax-addcl 10586 ax-addrcl 10587 ax-mulcl 10588 ax-mulrcl 10589 ax-mulcom 10590 ax-addass 10591 ax-mulass 10592 ax-distr 10593 ax-i2m1 10594 ax-1ne0 10595 ax-1rid 10596 ax-rnegex 10597 ax-rrecex 10598 ax-cnre 10599 ax-pre-lttri 10600 ax-pre-lttrn 10601 ax-pre-ltadd 10602 ax-pre-mulgt0 10603 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-nel 3092 df-ral 3111 df-rex 3112 df-reu 3113 df-rab 3115 df-v 3443 df-sbc 3721 df-csb 3829 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-pss 3900 df-nul 4244 df-if 4426 df-pw 4499 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4801 df-int 4839 df-iun 4883 df-br 5031 df-opab 5093 df-mpt 5111 df-tr 5137 df-id 5425 df-eprel 5430 df-po 5438 df-so 5439 df-fr 5478 df-we 5480 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-ima 5532 df-pred 6116 df-ord 6162 df-on 6163 df-lim 6164 df-suc 6165 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-f1 6329 df-fo 6330 df-f1o 6331 df-fv 6332 df-riota 7093 df-ov 7138 df-oprab 7139 df-mpo 7140 df-om 7561 df-1st 7671 df-2nd 7672 df-wrecs 7930 df-recs 7991 df-rdg 8029 df-1o 8085 df-er 8272 df-en 8493 df-dom 8494 df-sdom 8495 df-fin 8496 df-card 9352 df-pnf 10666 df-mnf 10667 df-xr 10668 df-ltxr 10669 df-le 10670 df-sub 10861 df-neg 10862 df-nn 11626 df-n0 11886 df-z 11970 df-uz 12232 df-fz 12886 df-hash 13687 |
This theorem is referenced by: hashrabrsn 13729 hashrabsn01 13730 hashrabsn1 13731 hashge0 13744 elprchashprn2 13753 hash1 13761 hashsn01 13773 hashgt12el 13779 hashgt12el2 13780 hashfzo 13786 hashfzp1 13788 hashxplem 13790 hashmap 13792 hashbc 13807 hashf1lem2 13810 hashf1 13811 hash2pwpr 13830 wrdnfi 13891 lsw0g 13909 ccatlid 13931 ccatrid 13932 rev0 14117 repswsymballbi 14133 fsumconst 15137 incexclem 15183 incexc 15184 fprodconst 15324 sumodd 15729 hashgcdeq 16116 prmreclem4 16245 prmreclem5 16246 0hashbc 16333 ramz2 16350 cshws0 16427 psgnunilem2 18615 psgnunilem4 18617 psgn0fv0 18631 psgnsn 18640 psgnprfval1 18642 efginvrel2 18845 efgredleme 18861 efgcpbllemb 18873 frgpnabllem1 18986 gsumconst 19047 ltbwe 20712 fta1g 24768 fta1 24904 birthdaylem3 25539 ppi1 25749 musum 25776 rpvmasum 26110 umgrislfupgrlem 26915 lfuhgr1v0e 27044 vtxdg0e 27264 vtxdlfgrval 27275 rusgr1vtxlem 27377 wspn0 27710 rusgrnumwwlkl1 27754 rusgr0edg 27759 clwwlknonel 27880 clwwlknon1le1 27886 0ewlk 27899 0wlk 27901 0wlkon 27905 0pth 27910 0clwlk 27915 0crct 27918 0cycl 27919 eupth0 27999 eulerpathpr 28025 wlkl0 28152 f1ocnt 30551 hashxpe 30555 lvecdim0 31093 esumcst 31432 cntmeas 31595 ballotlemfval0 31863 signsvtn0 31950 signstfvneq0 31952 signstfveq0 31957 signsvf0 31960 lpadright 32065 derangsn 32530 subfacp1lem6 32545 poimirlem25 35082 poimirlem26 35083 poimirlem27 35084 poimirlem28 35085 rp-isfinite6 40226 fzisoeu 41932 |
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