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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 2766 | . 2 ⊢ ∅ = ∅ | |
| 2 | 0ex 5275 | . . 3 ⊢ ∅ ∈ V | |
| 3 | hasheq0 14419 | . . 3 ⊢ (∅ ∈ V → ((♯‘∅) = 0 ↔ ∅ = ∅)) | |
| 4 | 2, 3 | ax-mp 5 | . 2 ⊢ ((♯‘∅) = 0 ↔ ∅ = ∅) |
| 5 | 1, 4 | mpbir 234 | 1 ⊢ (♯‘∅) = 0 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 = wceq 1570 ∈ wcel 2146 Vcvv 3458 ∅c0 4289 ‘cfv 6543 0cc0 11118 ♯chash 14386 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2738 ax-sep 5262 ax-nul 5274 ax-pow 5341 ax-pr 5409 ax-un 7745 ax-cnex 11174 ax-resscn 11175 ax-1cn 11176 ax-icn 11177 ax-addcl 11178 ax-addrcl 11179 ax-mulcl 11180 ax-mulrcl 11181 ax-mulcom 11182 ax-addass 11183 ax-mulass 11184 ax-distr 11185 ax-i2m1 11186 ax-1ne0 11187 ax-1rid 11188 ax-rnegex 11189 ax-rrecex 11190 ax-cnre 11191 ax-pre-lttri 11192 ax-pre-lttrn 11193 ax-pre-ltadd 11194 ax-pre-mulgt0 11195 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2570 df-eu 2600 df-clab 2745 df-cleq 2758 df-clel 2841 df-nfc 2915 df-ne 2962 df-nel 3068 df-ral 3083 df-rex 3093 df-reu 3373 df-rab 3420 df-v 3460 df-sbc 3748 df-csb 3857 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-pss 3928 df-nul 4290 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4878 df-int 4918 df-iun 4963 df-br 5115 df-opab 5179 df-mpt 5198 df-tr 5224 df-id 5561 df-eprel 5566 df-po 5574 df-so 5575 df-fr 5619 df-we 5621 df-xp 5672 df-rel 5673 df-cnv 5674 df-co 5675 df-dm 5676 df-rn 5677 df-res 5678 df-ima 5679 df-pred 6309 df-ord 6370 df-on 6371 df-lim 6372 df-suc 6373 df-iota 6499 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7380 df-ov 7426 df-oprab 7427 df-mpo 7428 df-om 7872 df-1st 7995 df-2nd 7996 df-frecs 8287 df-wrecs 8318 df-recs 8367 df-rdg 8406 df-1o 8462 df-er 8703 df-en 8953 df-dom 8954 df-sdom 8955 df-fin 8956 df-card 9944 df-pnf 11263 df-mnf 11264 df-xr 11265 df-ltxr 11266 df-le 11267 df-sub 11461 df-neg 11462 df-nn 12252 df-n0 12523 df-z 12610 df-uz 12881 df-fz 13554 df-hash 14387 |
| This theorem is used by: hashrabrsn 14428 hashrabsn01 14429 hashrabsn1 14430 hashge0 14443 elprchashprn2 14452 hash1 14460 hashsn01 14473 hashgt12el 14479 hashgt12el2 14480 hashfzo 14486 hashfzp1 14488 hashxplem 14490 hashmap 14492 hashbc 14510 hashf1lem2 14513 hashf1 14514 hash2pwpr 14533 wrdnfi 14605 lsw0g 14623 ccatlid 14644 ccatrid 14645 rev0 14825 repswsymballbi 14843 fsumconst 15867 incexclem 15916 incexc 15917 fprodconst 16058 sumodd 16471 hashgcdeq 16874 prmreclem4 17004 prmreclem5 17005 0hashbc 17092 ramz2 17109 cshws0 17186 chnub 18703 chnccats1 18706 chnccat 18707 psgnunilem2 19596 psgnunilem4 19598 psgn0fv0 19612 psgnsn 19621 psgnprfval1 19623 efginvrel2 19828 efgredleme 19844 efgcpbllemb 19856 frgpnabllem1 19974 gsumconst 20035 ltbwe 22232 fta1g 26364 fta1 26506 birthdaylem3 27155 ppi1 27365 musum 27392 rpvmasum 27727 umgrislfupgrlem 29509 lfuhgr1v0e 29641 vtxdg0e 29861 vtxdlfgrval 29872 rusgr1vtxlem 29974 wspn0 30310 rusgrnumwwlkl1 30357 rusgr0edg 30362 clwwlknonel 30483 clwwlknon1le1 30489 0ewlk 30502 0wlk 30504 0wlkon 30508 0pth 30513 0clwlk 30518 0crct 30521 0cycl 30522 eupth0 30602 eulerpathpr 30628 wlkl0 30755 f1ocnt 33182 hashxpe 33189 1arithidom 33858 esplyfval0 33985 vieta 34001 lvecdim0 34028 fldext2chn 34149 esumcst 34484 cntmeas 34648 ballotlemfval0 34918 signsvtn0 34989 signstfvneq0 34991 signstfveq0 34996 signsvf0 34999 lpadright 35106 derangsn 35683 subfacp1lem6 35698 poimirlem25 38337 poimirlem26 38338 poimirlem27 38339 poimirlem28 38340 unitscyglem4 43006 rp-isfinite6 44285 fzisoeu 46060 chnerlem1 47639 |
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