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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 2737 | . 2 ⊢ ∅ = ∅ | |
| 2 | 0ex 5242 | . . 3 ⊢ ∅ ∈ V | |
| 3 | hasheq0 14316 | . . 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 1542 ∈ wcel 2114 Vcvv 3430 ∅c0 4274 ‘cfv 6492 0cc0 11029 ♯chash 14283 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5231 ax-nul 5241 ax-pow 5302 ax-pr 5370 ax-un 7682 ax-cnex 11085 ax-resscn 11086 ax-1cn 11087 ax-icn 11088 ax-addcl 11089 ax-addrcl 11090 ax-mulcl 11091 ax-mulrcl 11092 ax-mulcom 11093 ax-addass 11094 ax-mulass 11095 ax-distr 11096 ax-i2m1 11097 ax-1ne0 11098 ax-1rid 11099 ax-rnegex 11100 ax-rrecex 11101 ax-cnre 11102 ax-pre-lttri 11103 ax-pre-lttrn 11104 ax-pre-ltadd 11105 ax-pre-mulgt0 11106 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-int 4891 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5519 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7317 df-ov 7363 df-oprab 7364 df-mpo 7365 df-om 7811 df-1st 7935 df-2nd 7936 df-frecs 8224 df-wrecs 8255 df-recs 8304 df-rdg 8342 df-1o 8398 df-er 8636 df-en 8887 df-dom 8888 df-sdom 8889 df-fin 8890 df-card 9854 df-pnf 11172 df-mnf 11173 df-xr 11174 df-ltxr 11175 df-le 11176 df-sub 11370 df-neg 11371 df-nn 12166 df-n0 12429 df-z 12516 df-uz 12780 df-fz 13453 df-hash 14284 |
| This theorem is referenced by: hashrabrsn 14325 hashrabsn01 14326 hashrabsn1 14327 hashge0 14340 elprchashprn2 14349 hash1 14357 hashsn01 14369 hashgt12el 14375 hashgt12el2 14376 hashfzo 14382 hashfzp1 14384 hashxplem 14386 hashmap 14388 hashbc 14406 hashf1lem2 14409 hashf1 14410 hash2pwpr 14429 wrdnfi 14501 lsw0g 14519 ccatlid 14540 ccatrid 14541 rev0 14717 repswsymballbi 14733 fsumconst 15743 incexclem 15792 incexc 15793 fprodconst 15934 sumodd 16348 hashgcdeq 16751 prmreclem4 16881 prmreclem5 16882 0hashbc 16969 ramz2 16986 cshws0 17063 chnub 18579 chnccats1 18582 chnccat 18583 psgnunilem2 19461 psgnunilem4 19463 psgn0fv0 19477 psgnsn 19486 psgnprfval1 19488 efginvrel2 19693 efgredleme 19709 efgcpbllemb 19721 frgpnabllem1 19839 gsumconst 19900 ltbwe 22032 fta1g 26145 fta1 26285 birthdaylem3 26930 ppi1 27141 musum 27168 rpvmasum 27503 umgrislfupgrlem 29205 lfuhgr1v0e 29337 vtxdg0e 29558 vtxdlfgrval 29569 rusgr1vtxlem 29671 wspn0 30007 rusgrnumwwlkl1 30054 rusgr0edg 30059 clwwlknonel 30180 clwwlknon1le1 30186 0ewlk 30199 0wlk 30201 0wlkon 30205 0pth 30210 0clwlk 30215 0crct 30218 0cycl 30219 eupth0 30299 eulerpathpr 30325 wlkl0 30452 f1ocnt 32888 hashxpe 32895 1arithidom 33612 esplyfval0 33723 vieta 33739 lvecdim0 33766 fldext2chn 33888 esumcst 34223 cntmeas 34386 ballotlemfval0 34656 signsvtn0 34730 signstfvneq0 34732 signstfveq0 34737 signsvf0 34740 lpadright 34844 derangsn 35368 subfacp1lem6 35383 poimirlem25 37980 poimirlem26 37981 poimirlem27 37982 poimirlem28 37983 unitscyglem4 42651 rp-isfinite6 43963 fzisoeu 45751 chnerlem1 47328 |
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