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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 2737 | . 2 ⊢ ∅ = ∅ | |
| 2 | 0ex 5254 | . . 3 ⊢ ∅ ∈ V | |
| 3 | hasheq0 14298 | . . 3 ⊢ (∅ ∈ V → ((♯‘∅) = 0 ↔ ∅ = ∅)) | |
| 4 | 2, 3 | ax-mp 5 | . 2 ⊢ ((♯‘∅) = 0 ↔ ∅ = ∅) |
| 5 | 1, 4 | mpbir 231 | 1 ⊢ (♯‘∅) = 0 |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 = wceq 1542 ∈ wcel 2114 Vcvv 3442 ∅c0 4287 ‘cfv 6500 0cc0 11038 ♯chash 14265 |
| 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 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 |
| 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 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-int 4905 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-ord 6328 df-on 6329 df-lim 6330 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-riota 7325 df-ov 7371 df-oprab 7372 df-mpo 7373 df-om 7819 df-1st 7943 df-2nd 7944 df-frecs 8233 df-wrecs 8264 df-recs 8313 df-rdg 8351 df-1o 8407 df-er 8645 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 df-card 9863 df-pnf 11180 df-mnf 11181 df-xr 11182 df-ltxr 11183 df-le 11184 df-sub 11378 df-neg 11379 df-nn 12158 df-n0 12414 df-z 12501 df-uz 12764 df-fz 13436 df-hash 14266 |
| This theorem is referenced by: hashrabrsn 14307 hashrabsn01 14308 hashrabsn1 14309 hashge0 14322 elprchashprn2 14331 hash1 14339 hashsn01 14351 hashgt12el 14357 hashgt12el2 14358 hashfzo 14364 hashfzp1 14366 hashxplem 14368 hashmap 14370 hashbc 14388 hashf1lem2 14391 hashf1 14392 hash2pwpr 14411 wrdnfi 14483 lsw0g 14501 ccatlid 14522 ccatrid 14523 rev0 14699 repswsymballbi 14715 fsumconst 15725 incexclem 15771 incexc 15772 fprodconst 15913 sumodd 16327 hashgcdeq 16729 prmreclem4 16859 prmreclem5 16860 0hashbc 16947 ramz2 16964 cshws0 17041 chnub 18557 chnccats1 18560 chnccat 18561 psgnunilem2 19436 psgnunilem4 19438 psgn0fv0 19452 psgnsn 19461 psgnprfval1 19463 efginvrel2 19668 efgredleme 19684 efgcpbllemb 19696 frgpnabllem1 19814 gsumconst 19875 ltbwe 22011 fta1g 26143 fta1 26284 birthdaylem3 26931 ppi1 27142 musum 27169 rpvmasum 27505 umgrislfupgrlem 29207 lfuhgr1v0e 29339 vtxdg0e 29560 vtxdlfgrval 29571 rusgr1vtxlem 29673 wspn0 30009 rusgrnumwwlkl1 30056 rusgr0edg 30061 clwwlknonel 30182 clwwlknon1le1 30188 0ewlk 30201 0wlk 30203 0wlkon 30207 0pth 30212 0clwlk 30217 0crct 30220 0cycl 30221 eupth0 30301 eulerpathpr 30327 wlkl0 30454 f1ocnt 32890 hashxpe 32897 1arithidom 33629 esplyfval0 33740 vieta 33756 lvecdim0 33783 fldext2chn 33905 esumcst 34240 cntmeas 34403 ballotlemfval0 34673 signsvtn0 34747 signstfvneq0 34749 signstfveq0 34754 signsvf0 34757 lpadright 34861 derangsn 35383 subfacp1lem6 35398 poimirlem25 37893 poimirlem26 37894 poimirlem27 37895 poimirlem28 37896 unitscyglem4 42565 rp-isfinite6 43871 fzisoeu 45659 chnerlem1 47237 |
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