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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 2761 | . 2 ⊢ ∅ = ∅ | |
| 2 | 0ex 5261 | . . 3 ⊢ ∅ ∈ V | |
| 3 | hasheq0 14487 | . . 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 2145 Vcvv 3451 ∅c0 4279 ‘cfv 6531 0cc0 11181 ♯chash 14454 |
| 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 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7740 ax-cnex 11237 ax-resscn 11238 ax-1cn 11239 ax-icn 11240 ax-addcl 11241 ax-addrcl 11242 ax-mulcl 11243 ax-mulrcl 11244 ax-mulcom 11245 ax-addass 11246 ax-mulass 11247 ax-distr 11248 ax-i2m1 11249 ax-1ne0 11250 ax-1rid 11251 ax-rnegex 11252 ax-rrecex 11253 ax-cnre 11254 ax-pre-lttri 11255 ax-pre-lttrn 11256 ax-pre-ltadd 11257 ax-pre-mulgt0 11258 |
| 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 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-int 4908 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6297 df-ord 6358 df-on 6359 df-lim 6360 df-suc 6361 df-iota 6487 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-fv 6539 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7867 df-1st 7990 df-2nd 7991 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-1o 8460 df-er 8701 df-en 8958 df-dom 8959 df-sdom 8960 df-fin 8961 df-card 10001 df-pnf 11326 df-mnf 11327 df-xr 11328 df-ltxr 11329 df-le 11330 df-sub 11524 df-neg 11525 df-nn 12317 df-n0 12588 df-z 12675 df-uz 12947 df-fz 13621 df-hash 14455 |
| This theorem is used by: hashrabrsn 14496 hashrabsn01 14497 hashrabsn1 14498 hashge0 14511 elprchashprn2 14520 hash1 14528 hashsn01 14541 hashgt12el 14547 hashgt12el2 14548 hashfzo 14554 hashfzp1 14556 hashxplem 14558 hashmap 14560 hashbc 14578 hashf1lem2 14581 hashf1 14582 hash2pwpr 14601 wrdnfi 14673 lsw0g 14691 ccatlid 14712 ccatrid 14713 rev0 14893 repswsymballbi 14911 fsumconst 15936 incexclem 15985 incexc 15986 fprodconst 16125 sumodd 16538 hashgcdeq 16947 prmreclem4 17077 prmreclem5 17078 0hashbc 17165 ramz2 17182 cshws0 17259 chnub 18776 chnccats1 18779 chnccat 18780 psgnunilem2 19689 psgnunilem4 19691 psgn0fv0 19705 psgnsn 19714 psgnprfval1 19716 efginvrel2 19921 efgredleme 19937 efgcpbllemb 19949 frgpnabllem1 20067 gsumconst 20128 ltbwe 22333 fta1g 26468 fta1 26611 birthdaylem3 27263 ppi1 27473 musum 27500 rpvmasum 27835 umgrislfupgrlem 29682 lfuhgr1v0e 29817 vtxdg0e 30037 vtxdlfgrval 30048 rusgr1vtxlem 30150 wspn0 30495 rusgrnumwwlkl1 30542 rusgr0edg 30547 clwwlknonel 30668 clwwlknon1le1 30674 0ewlk 30687 0wlk 30689 0wlkon 30693 0pth 30698 0clwlk 30703 0crct 30706 0cycl 30707 eupth0 30797 eulerpathpr 30823 wlkl0 30950 f1ocnt 33374 hashxpe 33381 1arithidom 34051 esplyfval0 34178 vieta 34194 lvecdim0 34221 fldext2chn 34342 esumcst 34677 cntmeas 34841 ballotlemfval0 35111 signsvtn0 35182 signstfvneq0 35184 signstfveq0 35189 signsvf0 35192 lpadright 35299 derangsn 35904 subfacp1lem6 35919 poimirlem25 38531 poimirlem26 38532 poimirlem27 38533 poimirlem28 38534 unitscyglem4 43216 rp-isfinite6 44477 fzisoeu 46259 chnerlem1 47836 |
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