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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 2752 | . 2 ⊢ ∅ = ∅ | |
| 2 | 0ex 5247 | . . 3 ⊢ ∅ ∈ V | |
| 3 | hasheq0 14362 | . . 3 ⊢ (∅ ∈ V → ((♯‘∅) = 0 ↔ ∅ = ∅)) | |
| 4 | 2, 3 | ax-mp 5 | . 2 ⊢ ((♯‘∅) = 0 ↔ ∅ = ∅) |
| 5 | 1, 4 | mpbir 233 | 1 ⊢ (♯‘∅) = 0 |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 208 = wceq 1550 ∈ wcel 2132 Vcvv 3444 ∅c0 4276 ‘cfv 6506 0cc0 11059 ♯chash 14329 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1805 ax-4 1819 ax-5 1920 ax-6 1977 ax-7 2018 ax-8 2134 ax-9 2142 ax-10 2165 ax-11 2181 ax-12 2202 ax-ext 2724 ax-sep 5236 ax-nul 5246 ax-pow 5312 ax-pr 5380 ax-un 7703 ax-cnex 11115 ax-resscn 11116 ax-1cn 11117 ax-icn 11118 ax-addcl 11119 ax-addrcl 11120 ax-mulcl 11121 ax-mulrcl 11122 ax-mulcom 11123 ax-addass 11124 ax-mulass 11125 ax-distr 11126 ax-i2m1 11127 ax-1ne0 11128 ax-1rid 11129 ax-rnegex 11130 ax-rrecex 11131 ax-cnre 11132 ax-pre-lttri 11133 ax-pre-lttrn 11134 ax-pre-ltadd 11135 ax-pre-mulgt0 11136 |
| This theorem depends on definitions: df-bi 209 df-an 399 df-or 857 df-3or 1096 df-3an 1097 df-tru 1553 df-fal 1563 df-ex 1790 df-nf 1794 df-sb 2081 df-mo 2556 df-eu 2586 df-clab 2731 df-cleq 2744 df-clel 2827 df-nfc 2901 df-ne 2948 df-nel 3052 df-ral 3067 df-rex 3077 df-reu 3358 df-rab 3405 df-v 3446 df-sbc 3736 df-csb 3844 df-dif 3898 df-un 3900 df-in 3902 df-ss 3912 df-pss 3915 df-nul 4277 df-if 4471 df-pw 4547 df-sn 4573 df-pr 4575 df-op 4579 df-uni 4856 df-int 4896 df-iun 4941 df-br 5091 df-opab 5153 df-mpt 5172 df-tr 5198 df-id 5531 df-eprel 5536 df-po 5544 df-so 5545 df-fr 5589 df-we 5591 df-xp 5642 df-rel 5643 df-cnv 5644 df-co 5645 df-dm 5646 df-rn 5647 df-res 5648 df-ima 5649 df-pred 6273 df-ord 6334 df-on 6335 df-lim 6336 df-suc 6337 df-iota 6462 df-fun 6508 df-fn 6509 df-f 6510 df-f1 6511 df-fo 6512 df-f1o 6513 df-fv 6514 df-riota 7338 df-ov 7384 df-oprab 7385 df-mpo 7386 df-om 7832 df-1st 7955 df-2nd 7956 df-frecs 8246 df-wrecs 8277 df-recs 8326 df-rdg 8365 df-1o 8421 df-er 8662 df-en 8913 df-dom 8914 df-sdom 8915 df-fin 8916 df-card 9883 df-pnf 11204 df-mnf 11205 df-xr 11206 df-ltxr 11207 df-le 11208 df-sub 11402 df-neg 11403 df-nn 12197 df-n0 12468 df-z 12555 df-uz 12826 df-fz 13499 df-hash 14330 |
| This theorem is referenced by: hashrabrsn 14371 hashrabsn01 14372 hashrabsn1 14373 hashge0 14386 elprchashprn2 14395 hash1 14403 hashsn01 14415 hashgt12el 14421 hashgt12el2 14422 hashfzo 14428 hashfzp1 14430 hashxplem 14432 hashmap 14434 hashbc 14452 hashf1lem2 14455 hashf1 14456 hash2pwpr 14475 wrdnfi 14547 lsw0g 14565 ccatlid 14586 ccatrid 14587 rev0 14763 repswsymballbi 14779 fsumconst 15789 incexclem 15838 incexc 15839 fprodconst 15980 sumodd 16394 hashgcdeq 16797 prmreclem4 16927 prmreclem5 16928 0hashbc 17015 ramz2 17032 cshws0 17109 chnub 18626 chnccats1 18629 chnccat 18630 psgnunilem2 19507 psgnunilem4 19509 psgn0fv0 19523 psgnsn 19532 psgnprfval1 19534 efginvrel2 19739 efgredleme 19755 efgcpbllemb 19767 frgpnabllem1 19885 gsumconst 19946 ltbwe 22066 fta1g 26199 fta1 26338 birthdaylem3 26984 ppi1 27194 musum 27221 rpvmasum 27556 umgrislfupgrlem 29258 lfuhgr1v0e 29390 vtxdg0e 29610 vtxdlfgrval 29621 rusgr1vtxlem 29723 wspn0 30059 rusgrnumwwlkl1 30106 rusgr0edg 30111 clwwlknonel 30232 clwwlknon1le1 30238 0ewlk 30251 0wlk 30253 0wlkon 30257 0pth 30262 0clwlk 30267 0crct 30270 0cycl 30271 eupth0 30351 eulerpathpr 30377 wlkl0 30504 f1ocnt 32941 hashxpe 32948 1arithidom 33677 esplyfval0 33805 vieta 33821 lvecdim0 33848 fldext2chn 33969 esumcst 34304 cntmeas 34467 ballotlemfval0 34737 signsvtn0 34811 signstfvneq0 34813 signstfveq0 34818 signsvf0 34821 lpadright 34928 derangsn 35458 subfacp1lem6 35473 poimirlem25 38082 poimirlem26 38083 poimirlem27 38084 poimirlem28 38085 unitscyglem4 42753 rp-isfinite6 44032 fzisoeu 45817 chnerlem1 47396 |
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