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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 2765 | . 2 ⊢ ∅ = ∅ | |
| 2 | 0ex 5261 | . . 3 ⊢ ∅ ∈ V | |
| 3 | hasheq0 14387 | . . 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 1563 ∈ wcel 2145 Vcvv 3457 ∅c0 4288 ‘cfv 6525 0cc0 11088 ♯chash 14354 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2737 ax-sep 5250 ax-nul 5260 ax-pow 5326 ax-pr 5394 ax-un 7722 ax-cnex 11144 ax-resscn 11145 ax-1cn 11146 ax-icn 11147 ax-addcl 11148 ax-addrcl 11149 ax-mulcl 11150 ax-mulrcl 11151 ax-mulcom 11152 ax-addass 11153 ax-mulass 11154 ax-distr 11155 ax-i2m1 11156 ax-1ne0 11157 ax-1rid 11158 ax-rnegex 11159 ax-rrecex 11160 ax-cnre 11161 ax-pre-lttri 11162 ax-pre-lttrn 11163 ax-pre-ltadd 11164 ax-pre-mulgt0 11165 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-nf 1807 df-sb 2094 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3065 df-ral 3080 df-rex 3090 df-reu 3371 df-rab 3418 df-v 3459 df-sbc 3748 df-csb 3856 df-dif 3910 df-un 3912 df-in 3914 df-ss 3924 df-pss 3927 df-nul 4289 df-if 4484 df-pw 4560 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4868 df-int 4908 df-iun 4953 df-br 5105 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 6291 df-ord 6352 df-on 6353 df-lim 6354 df-suc 6355 df-iota 6481 df-fun 6527 df-fn 6528 df-f 6529 df-f1 6530 df-fo 6531 df-f1o 6532 df-fv 6533 df-riota 7357 df-ov 7403 df-oprab 7404 df-mpo 7405 df-om 7851 df-1st 7974 df-2nd 7975 df-frecs 8266 df-wrecs 8297 df-recs 8346 df-rdg 8385 df-1o 8441 df-er 8682 df-en 8932 df-dom 8933 df-sdom 8934 df-fin 8935 df-card 9913 df-pnf 11233 df-mnf 11234 df-xr 11235 df-ltxr 11236 df-le 11237 df-sub 11431 df-neg 11432 df-nn 12222 df-n0 12493 df-z 12580 df-uz 12851 df-fz 13524 df-hash 14355 |
| This theorem is referenced by: hashrabrsn 14396 hashrabsn01 14397 hashrabsn1 14398 hashge0 14411 elprchashprn2 14420 hash1 14428 hashsn01 14441 hashgt12el 14447 hashgt12el2 14448 hashfzo 14454 hashfzp1 14456 hashxplem 14458 hashmap 14460 hashbc 14478 hashf1lem2 14481 hashf1 14482 hash2pwpr 14501 wrdnfi 14573 lsw0g 14591 ccatlid 14612 ccatrid 14613 rev0 14789 repswsymballbi 14805 fsumconst 15829 incexclem 15878 incexc 15879 fprodconst 16020 sumodd 16434 hashgcdeq 16837 prmreclem4 16967 prmreclem5 16968 0hashbc 17055 ramz2 17072 cshws0 17149 chnub 18666 chnccats1 18669 chnccat 18670 psgnunilem2 19553 psgnunilem4 19555 psgn0fv0 19569 psgnsn 19578 psgnprfval1 19580 efginvrel2 19785 efgredleme 19801 efgcpbllemb 19813 frgpnabllem1 19931 gsumconst 19992 ltbwe 22152 fta1g 26284 fta1 26426 birthdaylem3 27072 ppi1 27282 musum 27309 rpvmasum 27644 umgrislfupgrlem 29377 lfuhgr1v0e 29509 vtxdg0e 29729 vtxdlfgrval 29740 rusgr1vtxlem 29842 wspn0 30178 rusgrnumwwlkl1 30225 rusgr0edg 30230 clwwlknonel 30351 clwwlknon1le1 30357 0ewlk 30370 0wlk 30372 0wlkon 30376 0pth 30381 0clwlk 30386 0crct 30389 0cycl 30390 eupth0 30470 eulerpathpr 30496 wlkl0 30623 f1ocnt 33053 hashxpe 33060 1arithidom 33739 esplyfval0 33866 vieta 33882 lvecdim0 33909 fldext2chn 34030 esumcst 34365 cntmeas 34528 ballotlemfval0 34798 signsvtn0 34869 signstfvneq0 34871 signstfveq0 34876 signsvf0 34879 lpadright 34986 derangsn 35528 subfacp1lem6 35543 poimirlem25 38151 poimirlem26 38152 poimirlem27 38153 poimirlem28 38154 unitscyglem4 42822 rp-isfinite6 44101 fzisoeu 45878 chnerlem1 47457 |
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