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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 5242 | . . 3 ⊢ ∅ ∈ V | |
| 3 | hasheq0 14325 | . . 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 3429 ∅c0 4273 ‘cfv 6498 0cc0 11038 ♯chash 14292 |
| 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 2708 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 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 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 3062 df-reu 3343 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-pss 3909 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-int 4890 df-iun 4935 df-br 5086 df-opab 5148 df-mpt 5167 df-tr 5193 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6265 df-ord 6326 df-on 6327 df-lim 6328 df-suc 6329 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-riota 7324 df-ov 7370 df-oprab 7371 df-mpo 7372 df-om 7818 df-1st 7942 df-2nd 7943 df-frecs 8231 df-wrecs 8262 df-recs 8311 df-rdg 8349 df-1o 8405 df-er 8643 df-en 8894 df-dom 8895 df-sdom 8896 df-fin 8897 df-card 9863 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-sub 11379 df-neg 11380 df-nn 12175 df-n0 12438 df-z 12525 df-uz 12789 df-fz 13462 df-hash 14293 |
| This theorem is referenced by: hashrabrsn 14334 hashrabsn01 14335 hashrabsn1 14336 hashge0 14349 elprchashprn2 14358 hash1 14366 hashsn01 14378 hashgt12el 14384 hashgt12el2 14385 hashfzo 14391 hashfzp1 14393 hashxplem 14395 hashmap 14397 hashbc 14415 hashf1lem2 14418 hashf1 14419 hash2pwpr 14438 wrdnfi 14510 lsw0g 14528 ccatlid 14549 ccatrid 14550 rev0 14726 repswsymballbi 14742 fsumconst 15752 incexclem 15801 incexc 15802 fprodconst 15943 sumodd 16357 hashgcdeq 16760 prmreclem4 16890 prmreclem5 16891 0hashbc 16978 ramz2 16995 cshws0 17072 chnub 18588 chnccats1 18591 chnccat 18592 psgnunilem2 19470 psgnunilem4 19472 psgn0fv0 19486 psgnsn 19495 psgnprfval1 19497 efginvrel2 19702 efgredleme 19718 efgcpbllemb 19730 frgpnabllem1 19848 gsumconst 19909 ltbwe 22022 fta1g 26135 fta1 26274 birthdaylem3 26917 ppi1 27127 musum 27154 rpvmasum 27489 umgrislfupgrlem 29191 lfuhgr1v0e 29323 vtxdg0e 29543 vtxdlfgrval 29554 rusgr1vtxlem 29656 wspn0 29992 rusgrnumwwlkl1 30039 rusgr0edg 30044 clwwlknonel 30165 clwwlknon1le1 30171 0ewlk 30184 0wlk 30186 0wlkon 30190 0pth 30195 0clwlk 30200 0crct 30203 0cycl 30204 eupth0 30284 eulerpathpr 30310 wlkl0 30437 f1ocnt 32873 hashxpe 32880 1arithidom 33597 esplyfval0 33708 vieta 33724 lvecdim0 33751 fldext2chn 33872 esumcst 34207 cntmeas 34370 ballotlemfval0 34640 signsvtn0 34714 signstfvneq0 34716 signstfveq0 34721 signsvf0 34724 lpadright 34828 derangsn 35352 subfacp1lem6 35367 poimirlem25 37966 poimirlem26 37967 poimirlem27 37968 poimirlem28 37969 unitscyglem4 42637 rp-isfinite6 43945 fzisoeu 45733 chnerlem1 47312 |
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