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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 2762 | . 2 ⊢ ∅ = ∅ | |
| 2 | 0ex 5268 | . . 3 ⊢ ∅ ∈ V | |
| 3 | hasheq0 14431 | . . 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 3453 ∅c0 4282 ‘cfv 6537 0cc0 11128 ♯chash 14398 |
| 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 2215 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7740 ax-cnex 11184 ax-resscn 11185 ax-1cn 11186 ax-icn 11187 ax-addcl 11188 ax-addrcl 11189 ax-mulcl 11190 ax-mulrcl 11191 ax-mulcom 11192 ax-addass 11193 ax-mulass 11194 ax-distr 11195 ax-i2m1 11196 ax-1ne0 11197 ax-1rid 11198 ax-rnegex 11199 ax-rrecex 11200 ax-cnre 11201 ax-pre-lttri 11202 ax-pre-lttrn 11203 ax-pre-ltadd 11204 ax-pre-mulgt0 11205 |
| 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 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-int 4911 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-we 5614 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 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7374 df-ov 7420 df-oprab 7421 df-mpo 7422 df-om 7867 df-1st 7990 df-2nd 7991 df-frecs 8284 df-wrecs 8315 df-recs 8364 df-rdg 8403 df-1o 8459 df-er 8700 df-en 8957 df-dom 8958 df-sdom 8959 df-fin 8960 df-card 9948 df-pnf 11273 df-mnf 11274 df-xr 11275 df-ltxr 11276 df-le 11277 df-sub 11471 df-neg 11472 df-nn 12262 df-n0 12533 df-z 12620 df-uz 12892 df-fz 13566 df-hash 14399 |
| This theorem is used by: hashrabrsn 14440 hashrabsn01 14441 hashrabsn1 14442 hashge0 14455 elprchashprn2 14464 hash1 14472 hashsn01 14485 hashgt12el 14491 hashgt12el2 14492 hashfzo 14498 hashfzp1 14500 hashxplem 14502 hashmap 14504 hashbc 14522 hashf1lem2 14525 hashf1 14526 hash2pwpr 14545 wrdnfi 14617 lsw0g 14635 ccatlid 14656 ccatrid 14657 rev0 14837 repswsymballbi 14855 fsumconst 15880 incexclem 15929 incexc 15930 fprodconst 16071 sumodd 16484 hashgcdeq 16887 prmreclem4 17017 prmreclem5 17018 0hashbc 17105 ramz2 17122 cshws0 17199 chnub 18716 chnccats1 18719 chnccat 18720 psgnunilem2 19628 psgnunilem4 19630 psgn0fv0 19644 psgnsn 19653 psgnprfval1 19655 efginvrel2 19860 efgredleme 19876 efgcpbllemb 19888 frgpnabllem1 20006 gsumconst 20067 ltbwe 22266 fta1g 26402 fta1 26545 birthdaylem3 27198 ppi1 27408 musum 27435 rpvmasum 27770 umgrislfupgrlem 29587 lfuhgr1v0e 29722 vtxdg0e 29942 vtxdlfgrval 29953 rusgr1vtxlem 30055 wspn0 30400 rusgrnumwwlkl1 30447 rusgr0edg 30452 clwwlknonel 30573 clwwlknon1le1 30579 0ewlk 30592 0wlk 30594 0wlkon 30598 0pth 30603 0clwlk 30608 0crct 30611 0cycl 30612 eupth0 30702 eulerpathpr 30728 wlkl0 30855 f1ocnt 33279 hashxpe 33286 1arithidom 33955 esplyfval0 34082 vieta 34098 lvecdim0 34125 fldext2chn 34246 esumcst 34581 cntmeas 34745 ballotlemfval0 35015 signsvtn0 35086 signstfvneq0 35088 signstfveq0 35093 signsvf0 35096 lpadright 35203 derangsn 35757 subfacp1lem6 35772 poimirlem25 38402 poimirlem26 38403 poimirlem27 38404 poimirlem28 38405 unitscyglem4 43072 rp-isfinite6 44366 fzisoeu 46141 chnerlem1 47718 |
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