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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 5282 | . . 3 ⊢ ∅ ∈ V | |
| 3 | hasheq0 14386 | . . 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 1540 ∈ wcel 2109 Vcvv 3464 ∅c0 4313 ‘cfv 6536 0cc0 11134 ♯chash 14353 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2708 ax-sep 5271 ax-nul 5281 ax-pow 5340 ax-pr 5407 ax-un 7734 ax-cnex 11190 ax-resscn 11191 ax-1cn 11192 ax-icn 11193 ax-addcl 11194 ax-addrcl 11195 ax-mulcl 11196 ax-mulrcl 11197 ax-mulcom 11198 ax-addass 11199 ax-mulass 11200 ax-distr 11201 ax-i2m1 11202 ax-1ne0 11203 ax-1rid 11204 ax-rnegex 11205 ax-rrecex 11206 ax-cnre 11207 ax-pre-lttri 11208 ax-pre-lttrn 11209 ax-pre-ltadd 11210 ax-pre-mulgt0 11211 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2810 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3062 df-reu 3365 df-rab 3421 df-v 3466 df-sbc 3771 df-csb 3880 df-dif 3934 df-un 3936 df-in 3938 df-ss 3948 df-pss 3951 df-nul 4314 df-if 4506 df-pw 4582 df-sn 4607 df-pr 4609 df-op 4613 df-uni 4889 df-int 4928 df-iun 4974 df-br 5125 df-opab 5187 df-mpt 5207 df-tr 5235 df-id 5553 df-eprel 5558 df-po 5566 df-so 5567 df-fr 5611 df-we 5613 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6295 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-riota 7367 df-ov 7413 df-oprab 7414 df-mpo 7415 df-om 7867 df-1st 7993 df-2nd 7994 df-frecs 8285 df-wrecs 8316 df-recs 8390 df-rdg 8429 df-1o 8485 df-er 8724 df-en 8965 df-dom 8966 df-sdom 8967 df-fin 8968 df-card 9958 df-pnf 11276 df-mnf 11277 df-xr 11278 df-ltxr 11279 df-le 11280 df-sub 11473 df-neg 11474 df-nn 12246 df-n0 12507 df-z 12594 df-uz 12858 df-fz 13530 df-hash 14354 |
| This theorem is referenced by: hashrabrsn 14395 hashrabsn01 14396 hashrabsn1 14397 hashge0 14410 elprchashprn2 14419 hash1 14427 hashsn01 14439 hashgt12el 14445 hashgt12el2 14446 hashfzo 14452 hashfzp1 14454 hashxplem 14456 hashmap 14458 hashbc 14476 hashf1lem2 14479 hashf1 14480 hash2pwpr 14499 wrdnfi 14571 lsw0g 14589 ccatlid 14609 ccatrid 14610 rev0 14787 repswsymballbi 14803 fsumconst 15811 incexclem 15857 incexc 15858 fprodconst 15999 sumodd 16412 hashgcdeq 16814 prmreclem4 16944 prmreclem5 16945 0hashbc 17032 ramz2 17049 cshws0 17126 psgnunilem2 19481 psgnunilem4 19483 psgn0fv0 19497 psgnsn 19506 psgnprfval1 19508 efginvrel2 19713 efgredleme 19729 efgcpbllemb 19741 frgpnabllem1 19859 gsumconst 19920 ltbwe 22007 fta1g 26132 fta1 26273 birthdaylem3 26920 ppi1 27131 musum 27158 rpvmasum 27494 umgrislfupgrlem 29106 lfuhgr1v0e 29238 vtxdg0e 29459 vtxdlfgrval 29470 rusgr1vtxlem 29572 wspn0 29911 rusgrnumwwlkl1 29955 rusgr0edg 29960 clwwlknonel 30081 clwwlknon1le1 30087 0ewlk 30100 0wlk 30102 0wlkon 30106 0pth 30111 0clwlk 30116 0crct 30119 0cycl 30120 eupth0 30200 eulerpathpr 30226 wlkl0 30353 f1ocnt 32784 hashxpe 32791 chnub 32997 chnccats1 33000 1arithidom 33557 lvecdim0 33651 fldext2chn 33767 esumcst 34099 cntmeas 34262 ballotlemfval0 34533 signsvtn0 34607 signstfvneq0 34609 signstfveq0 34614 signsvf0 34617 lpadright 34721 derangsn 35197 subfacp1lem6 35212 poimirlem25 37674 poimirlem26 37675 poimirlem27 37676 poimirlem28 37677 unitscyglem4 42216 rp-isfinite6 43517 fzisoeu 45309 upwordnul 46889 |
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