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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 2740 | . 2 ⊢ ∅ = ∅ | |
| 2 | 0ex 5236 | . . 3 ⊢ ∅ ∈ V | |
| 3 | hasheq0 14323 | . . 3 ⊢ (∅ ∈ V → ((♯‘∅) = 0 ↔ ∅ = ∅)) | |
| 4 | 2, 3 | ax-mp 5 | . 2 ⊢ ((♯‘∅) = 0 ↔ ∅ = ∅) |
| 5 | 1, 4 | mpbir 232 | 1 ⊢ (♯‘∅) = 0 |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 207 = wceq 1547 ∈ wcel 2119 Vcvv 3432 ∅c0 4268 ‘cfv 6492 0cc0 11036 ♯chash 14290 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2712 ax-sep 5225 ax-nul 5235 ax-pow 5301 ax-pr 5369 ax-un 7685 ax-cnex 11092 ax-resscn 11093 ax-1cn 11094 ax-icn 11095 ax-addcl 11096 ax-addrcl 11097 ax-mulcl 11098 ax-mulrcl 11099 ax-mulcom 11100 ax-addass 11101 ax-mulass 11102 ax-distr 11103 ax-i2m1 11104 ax-1ne0 11105 ax-1rid 11106 ax-rnegex 11107 ax-rrecex 11108 ax-cnre 11109 ax-pre-lttri 11110 ax-pre-lttrn 11111 ax-pre-ltadd 11112 ax-pre-mulgt0 11113 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2719 df-cleq 2732 df-clel 2815 df-nfc 2889 df-ne 2936 df-nel 3040 df-ral 3055 df-rex 3065 df-reu 3346 df-rab 3393 df-v 3434 df-sbc 3731 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4269 df-if 4462 df-pw 4538 df-sn 4563 df-pr 4565 df-op 4569 df-uni 4846 df-int 4885 df-iun 4930 df-br 5080 df-opab 5142 df-mpt 5161 df-tr 5187 df-id 5520 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-we 5580 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 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 7320 df-ov 7366 df-oprab 7367 df-mpo 7368 df-om 7814 df-1st 7938 df-2nd 7939 df-frecs 8228 df-wrecs 8259 df-recs 8308 df-rdg 8346 df-1o 8402 df-er 8640 df-en 8891 df-dom 8892 df-sdom 8893 df-fin 8894 df-card 9861 df-pnf 11179 df-mnf 11180 df-xr 11181 df-ltxr 11182 df-le 11183 df-sub 11377 df-neg 11378 df-nn 12173 df-n0 12436 df-z 12523 df-uz 12787 df-fz 13460 df-hash 14291 |
| This theorem is referenced by: hashrabrsn 14332 hashrabsn01 14333 hashrabsn1 14334 hashge0 14347 elprchashprn2 14356 hash1 14364 hashsn01 14376 hashgt12el 14382 hashgt12el2 14383 hashfzo 14389 hashfzp1 14391 hashxplem 14393 hashmap 14395 hashbc 14413 hashf1lem2 14416 hashf1 14417 hash2pwpr 14436 wrdnfi 14508 lsw0g 14526 ccatlid 14547 ccatrid 14548 rev0 14724 repswsymballbi 14740 fsumconst 15750 incexclem 15799 incexc 15800 fprodconst 15941 sumodd 16355 hashgcdeq 16758 prmreclem4 16888 prmreclem5 16889 0hashbc 16976 ramz2 16993 cshws0 17070 chnub 18586 chnccats1 18589 chnccat 18590 psgnunilem2 19468 psgnunilem4 19470 psgn0fv0 19484 psgnsn 19493 psgnprfval1 19495 efginvrel2 19700 efgredleme 19716 efgcpbllemb 19728 frgpnabllem1 19846 gsumconst 19907 ltbwe 22027 fta1g 26160 fta1 26299 birthdaylem3 26942 ppi1 27152 musum 27179 rpvmasum 27514 umgrislfupgrlem 29216 lfuhgr1v0e 29348 vtxdg0e 29568 vtxdlfgrval 29579 rusgr1vtxlem 29681 wspn0 30017 rusgrnumwwlkl1 30064 rusgr0edg 30069 clwwlknonel 30190 clwwlknon1le1 30196 0ewlk 30209 0wlk 30211 0wlkon 30215 0pth 30220 0clwlk 30225 0crct 30228 0cycl 30229 eupth0 30309 eulerpathpr 30335 wlkl0 30462 f1ocnt 32899 hashxpe 32906 1arithidom 33627 esplyfval0 33755 vieta 33771 lvecdim0 33798 fldext2chn 33919 esumcst 34254 cntmeas 34417 ballotlemfval0 34687 signsvtn0 34761 signstfvneq0 34763 signstfveq0 34768 signsvf0 34771 lpadright 34875 derangsn 35405 subfacp1lem6 35420 poimirlem25 38019 poimirlem26 38020 poimirlem27 38021 poimirlem28 38022 unitscyglem4 42690 rp-isfinite6 43969 fzisoeu 45755 chnerlem1 47334 |
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