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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 5256 | . . 3 ⊢ ∅ ∈ V | |
| 3 | hasheq0 14373 | . . 3 ⊢ (∅ ∈ V → ((♯‘∅) = 0 ↔ ∅ = ∅)) | |
| 4 | 2, 3 | ax-mp 5 | . 2 ⊢ ((♯‘∅) = 0 ↔ ∅ = ∅) |
| 5 | 1, 4 | mpbir 233 | 1 ⊢ (♯‘∅) = 0 |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 208 = wceq 1559 ∈ wcel 2141 Vcvv 3453 ∅c0 4285 ‘cfv 6517 0cc0 11070 ♯chash 14340 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-sep 5245 ax-nul 5255 ax-pow 5321 ax-pr 5389 ax-un 7714 ax-cnex 11126 ax-resscn 11127 ax-1cn 11128 ax-icn 11129 ax-addcl 11130 ax-addrcl 11131 ax-mulcl 11132 ax-mulrcl 11133 ax-mulcom 11134 ax-addass 11135 ax-mulass 11136 ax-distr 11137 ax-i2m1 11138 ax-1ne0 11139 ax-1rid 11140 ax-rnegex 11141 ax-rrecex 11142 ax-cnre 11143 ax-pre-lttri 11144 ax-pre-lttrn 11145 ax-pre-ltadd 11146 ax-pre-mulgt0 11147 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1098 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-nf 1803 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3061 df-ral 3076 df-rex 3086 df-reu 3367 df-rab 3414 df-v 3455 df-sbc 3745 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4582 df-pr 4584 df-op 4588 df-uni 4865 df-int 4905 df-iun 4950 df-br 5100 df-opab 5162 df-mpt 5181 df-tr 5207 df-id 5540 df-eprel 5545 df-po 5553 df-so 5554 df-fr 5598 df-we 5600 df-xp 5651 df-rel 5652 df-cnv 5653 df-co 5654 df-dm 5655 df-rn 5656 df-res 5657 df-ima 5658 df-pred 6284 df-ord 6345 df-on 6346 df-lim 6347 df-suc 6348 df-iota 6473 df-fun 6519 df-fn 6520 df-f 6521 df-f1 6522 df-fo 6523 df-f1o 6524 df-fv 6525 df-riota 7349 df-ov 7395 df-oprab 7396 df-mpo 7397 df-om 7843 df-1st 7966 df-2nd 7967 df-frecs 8257 df-wrecs 8288 df-recs 8337 df-rdg 8376 df-1o 8432 df-er 8673 df-en 8924 df-dom 8925 df-sdom 8926 df-fin 8927 df-card 9894 df-pnf 11215 df-mnf 11216 df-xr 11217 df-ltxr 11218 df-le 11219 df-sub 11413 df-neg 11414 df-nn 12208 df-n0 12479 df-z 12566 df-uz 12837 df-fz 13510 df-hash 14341 |
| This theorem is referenced by: hashrabrsn 14382 hashrabsn01 14383 hashrabsn1 14384 hashge0 14397 elprchashprn2 14406 hash1 14414 hashsn01 14426 hashgt12el 14432 hashgt12el2 14433 hashfzo 14439 hashfzp1 14441 hashxplem 14443 hashmap 14445 hashbc 14463 hashf1lem2 14466 hashf1 14467 hash2pwpr 14486 wrdnfi 14558 lsw0g 14576 ccatlid 14597 ccatrid 14598 rev0 14774 repswsymballbi 14790 fsumconst 15800 incexclem 15849 incexc 15850 fprodconst 15991 sumodd 16405 hashgcdeq 16808 prmreclem4 16938 prmreclem5 16939 0hashbc 17026 ramz2 17043 cshws0 17120 chnub 18637 chnccats1 18640 chnccat 18641 psgnunilem2 19518 psgnunilem4 19520 psgn0fv0 19534 psgnsn 19543 psgnprfval1 19545 efginvrel2 19750 efgredleme 19766 efgcpbllemb 19778 frgpnabllem1 19896 gsumconst 19957 ltbwe 22077 fta1g 26210 fta1 26349 birthdaylem3 26995 ppi1 27205 musum 27232 rpvmasum 27567 umgrislfupgrlem 29269 lfuhgr1v0e 29401 vtxdg0e 29621 vtxdlfgrval 29632 rusgr1vtxlem 29734 wspn0 30070 rusgrnumwwlkl1 30117 rusgr0edg 30122 clwwlknonel 30243 clwwlknon1le1 30249 0ewlk 30262 0wlk 30264 0wlkon 30268 0pth 30273 0clwlk 30278 0crct 30281 0cycl 30282 eupth0 30362 eulerpathpr 30388 wlkl0 30515 f1ocnt 32952 hashxpe 32959 1arithidom 33694 esplyfval0 33822 vieta 33838 lvecdim0 33865 fldext2chn 33986 esumcst 34321 cntmeas 34484 ballotlemfval0 34754 signsvtn0 34828 signstfvneq0 34830 signstfveq0 34835 signsvf0 34838 lpadright 34945 derangsn 35484 subfacp1lem6 35499 poimirlem25 38108 poimirlem26 38109 poimirlem27 38110 poimirlem28 38111 unitscyglem4 42779 rp-isfinite6 44058 fzisoeu 45843 chnerlem1 47422 |
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