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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 2736 | . 2 ⊢ ∅ = ∅ | |
| 2 | 0ex 5252 | . . 3 ⊢ ∅ ∈ V | |
| 3 | hasheq0 14286 | . . 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 1541 ∈ wcel 2113 Vcvv 3440 ∅c0 4285 ‘cfv 6492 0cc0 11026 ♯chash 14253 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pow 5310 ax-pr 5377 ax-un 7680 ax-cnex 11082 ax-resscn 11083 ax-1cn 11084 ax-icn 11085 ax-addcl 11086 ax-addrcl 11087 ax-mulcl 11088 ax-mulrcl 11089 ax-mulcom 11090 ax-addass 11091 ax-mulass 11092 ax-distr 11093 ax-i2m1 11094 ax-1ne0 11095 ax-1rid 11096 ax-rnegex 11097 ax-rrecex 11098 ax-cnre 11099 ax-pre-lttri 11100 ax-pre-lttrn 11101 ax-pre-ltadd 11102 ax-pre-mulgt0 11103 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3061 df-reu 3351 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-pss 3921 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-int 4903 df-iun 4948 df-br 5099 df-opab 5161 df-mpt 5180 df-tr 5206 df-id 5519 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7315 df-ov 7361 df-oprab 7362 df-mpo 7363 df-om 7809 df-1st 7933 df-2nd 7934 df-frecs 8223 df-wrecs 8254 df-recs 8303 df-rdg 8341 df-1o 8397 df-er 8635 df-en 8884 df-dom 8885 df-sdom 8886 df-fin 8887 df-card 9851 df-pnf 11168 df-mnf 11169 df-xr 11170 df-ltxr 11171 df-le 11172 df-sub 11366 df-neg 11367 df-nn 12146 df-n0 12402 df-z 12489 df-uz 12752 df-fz 13424 df-hash 14254 |
| This theorem is referenced by: hashrabrsn 14295 hashrabsn01 14296 hashrabsn1 14297 hashge0 14310 elprchashprn2 14319 hash1 14327 hashsn01 14339 hashgt12el 14345 hashgt12el2 14346 hashfzo 14352 hashfzp1 14354 hashxplem 14356 hashmap 14358 hashbc 14376 hashf1lem2 14379 hashf1 14380 hash2pwpr 14399 wrdnfi 14471 lsw0g 14489 ccatlid 14510 ccatrid 14511 rev0 14687 repswsymballbi 14703 fsumconst 15713 incexclem 15759 incexc 15760 fprodconst 15901 sumodd 16315 hashgcdeq 16717 prmreclem4 16847 prmreclem5 16848 0hashbc 16935 ramz2 16952 cshws0 17029 chnub 18545 chnccats1 18548 chnccat 18549 psgnunilem2 19424 psgnunilem4 19426 psgn0fv0 19440 psgnsn 19449 psgnprfval1 19451 efginvrel2 19656 efgredleme 19672 efgcpbllemb 19684 frgpnabllem1 19802 gsumconst 19863 ltbwe 21999 fta1g 26131 fta1 26272 birthdaylem3 26919 ppi1 27130 musum 27157 rpvmasum 27493 umgrislfupgrlem 29195 lfuhgr1v0e 29327 vtxdg0e 29548 vtxdlfgrval 29559 rusgr1vtxlem 29661 wspn0 29997 rusgrnumwwlkl1 30044 rusgr0edg 30049 clwwlknonel 30170 clwwlknon1le1 30176 0ewlk 30189 0wlk 30191 0wlkon 30195 0pth 30200 0clwlk 30205 0crct 30208 0cycl 30209 eupth0 30289 eulerpathpr 30315 wlkl0 30442 f1ocnt 32880 hashxpe 32887 1arithidom 33618 esplyfval0 33722 vieta 33736 lvecdim0 33763 fldext2chn 33885 esumcst 34220 cntmeas 34383 ballotlemfval0 34653 signsvtn0 34727 signstfvneq0 34729 signstfveq0 34734 signsvf0 34737 lpadright 34841 derangsn 35364 subfacp1lem6 35379 poimirlem25 37842 poimirlem26 37843 poimirlem27 37844 poimirlem28 37845 unitscyglem4 42448 rp-isfinite6 43755 fzisoeu 45544 chnerlem1 47122 |
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