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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 2763 | . 2 ⊢ ∅ = ∅ | |
| 2 | 0ex 5271 | . . 3 ⊢ ∅ ∈ V | |
| 3 | hasheq0 14401 | . . 3 ⊢ (∅ ∈ V → ((♯‘∅) = 0 ↔ ∅ = ∅)) | |
| 4 | 2, 3 | ax-mp 5 | . 2 ⊢ ((♯‘∅) = 0 ↔ ∅ = ∅) |
| 5 | 1, 4 | mpbir 234 | 1 ⊢ (♯‘∅) = 0 |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 209 = wceq 1570 ∈ wcel 2143 Vcvv 3455 ∅c0 4287 ‘cfv 6538 0cc0 11101 ♯chash 14368 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-sep 5258 ax-nul 5270 ax-pow 5338 ax-pr 5406 ax-un 7734 ax-cnex 11157 ax-resscn 11158 ax-1cn 11159 ax-icn 11160 ax-addcl 11161 ax-addrcl 11162 ax-mulcl 11163 ax-mulrcl 11164 ax-mulcom 11165 ax-addass 11166 ax-mulass 11167 ax-distr 11168 ax-i2m1 11169 ax-1ne0 11170 ax-1rid 11171 ax-rnegex 11172 ax-rrecex 11173 ax-cnre 11174 ax-pre-lttri 11175 ax-pre-lttrn 11176 ax-pre-ltadd 11177 ax-pre-mulgt0 11178 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-nel 3065 df-ral 3080 df-rex 3090 df-reu 3370 df-rab 3417 df-v 3457 df-sbc 3746 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4288 df-if 4489 df-pw 4565 df-sn 4591 df-pr 4593 df-op 4597 df-uni 4874 df-int 4914 df-iun 4959 df-br 5111 df-opab 5175 df-mpt 5194 df-tr 5220 df-id 5558 df-eprel 5563 df-po 5571 df-so 5572 df-fr 5616 df-we 5618 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7864 df-1st 7987 df-2nd 7988 df-frecs 8279 df-wrecs 8310 df-recs 8359 df-rdg 8398 df-1o 8454 df-er 8695 df-en 8945 df-dom 8946 df-sdom 8947 df-fin 8948 df-card 9926 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11444 df-neg 11445 df-nn 12235 df-n0 12506 df-z 12593 df-uz 12864 df-fz 13537 df-hash 14369 |
| This theorem is referenced by: hashrabrsn 14410 hashrabsn01 14411 hashrabsn1 14412 hashge0 14425 elprchashprn2 14434 hash1 14442 hashsn01 14455 hashgt12el 14461 hashgt12el2 14462 hashfzo 14468 hashfzp1 14470 hashxplem 14472 hashmap 14474 hashbc 14492 hashf1lem2 14495 hashf1 14496 hash2pwpr 14515 wrdnfi 14587 lsw0g 14605 ccatlid 14626 ccatrid 14627 rev0 14803 repswsymballbi 14819 fsumconst 15843 incexclem 15892 incexc 15893 fprodconst 16034 sumodd 16447 hashgcdeq 16850 prmreclem4 16980 prmreclem5 16981 0hashbc 17068 ramz2 17085 cshws0 17162 chnub 18679 chnccats1 18682 chnccat 18683 psgnunilem2 19566 psgnunilem4 19568 psgn0fv0 19582 psgnsn 19591 psgnprfval1 19593 efginvrel2 19798 efgredleme 19814 efgcpbllemb 19826 frgpnabllem1 19944 gsumconst 20005 ltbwe 22176 fta1g 26308 fta1 26450 birthdaylem3 27099 ppi1 27309 musum 27336 rpvmasum 27671 umgrislfupgrlem 29453 lfuhgr1v0e 29585 vtxdg0e 29805 vtxdlfgrval 29816 rusgr1vtxlem 29918 wspn0 30254 rusgrnumwwlkl1 30301 rusgr0edg 30306 clwwlknonel 30427 clwwlknon1le1 30433 0ewlk 30446 0wlk 30448 0wlkon 30452 0pth 30457 0clwlk 30462 0crct 30465 0cycl 30466 eupth0 30546 eulerpathpr 30572 wlkl0 30699 f1ocnt 33126 hashxpe 33133 1arithidom 33808 esplyfval0 33935 vieta 33951 lvecdim0 33978 fldext2chn 34099 esumcst 34434 cntmeas 34597 ballotlemfval0 34867 signsvtn0 34938 signstfvneq0 34940 signstfveq0 34945 signsvf0 34948 lpadright 35055 derangsn 35643 subfacp1lem6 35658 poimirlem25 38277 poimirlem26 38278 poimirlem27 38279 poimirlem28 38280 unitscyglem4 42946 rp-isfinite6 44227 fzisoeu 46002 chnerlem1 47581 |
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