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| Mirrors > Home > MPE Home > Th. List > hashf | Structured version Visualization version GIF version | ||
| Description: The size function maps all finite sets to their cardinality, as members of ℕ0, and infinite sets to +∞. TODO-AV: mark as OBSOLETE and replace it by hashfxnn0 14386? (Contributed by Mario Carneiro, 13-Sep-2013.) (Revised by Mario Carneiro, 13-Jul-2014.) (Proof shortened by AV, 24-Oct-2021.) |
| Ref | Expression |
|---|---|
| hashf | ⊢ ♯:V⟶(ℕ0 ∪ {+∞}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | hashfxnn0 14386 | . 2 ⊢ ♯:V⟶ℕ0* | |
| 2 | eqid 2765 | . . 3 ⊢ V = V | |
| 3 | df-xnn0 12589 | . . . 4 ⊢ ℕ0* = (ℕ0 ∪ {+∞}) | |
| 4 | 3 | eqcomi 2774 | . . 3 ⊢ (ℕ0 ∪ {+∞}) = ℕ0* |
| 5 | 2, 4 | feq23i 6703 | . 2 ⊢ (♯:V⟶(ℕ0 ∪ {+∞}) ↔ ♯:V⟶ℕ0*) |
| 6 | 1, 5 | mpbir 234 | 1 ⊢ ♯:V⟶(ℕ0 ∪ {+∞}) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: Vcvv 3457 ∪ cun 3904 {csn 4591 ⟶wf 6536 +∞cpnf 11251 ℕ0cn0 12515 ℕ0*cxnn0 12588 ♯chash 14379 |
| 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 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 ax-un 7738 ax-cnex 11167 ax-resscn 11168 ax-1cn 11169 ax-icn 11170 ax-addcl 11171 ax-addrcl 11172 ax-mulcl 11173 ax-mulrcl 11174 ax-mulcom 11175 ax-addass 11176 ax-mulass 11177 ax-distr 11178 ax-i2m1 11179 ax-1ne0 11180 ax-1rid 11181 ax-rnegex 11182 ax-rrecex 11183 ax-cnre 11184 ax-pre-lttri 11185 ax-pre-lttrn 11186 ax-pre-ltadd 11187 ax-pre-mulgt0 11188 |
| 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 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3067 df-ral 3082 df-rex 3092 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-int 4915 df-iun 4960 df-br 5112 df-opab 5176 df-mpt 5195 df-tr 5221 df-id 5558 df-eprel 5563 df-po 5571 df-so 5572 df-fr 5616 df-we 5618 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-pred 6306 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7373 df-ov 7419 df-oprab 7420 df-mpo 7421 df-om 7865 df-2nd 7989 df-frecs 8280 df-wrecs 8311 df-recs 8360 df-rdg 8399 df-1o 8455 df-er 8696 df-en 8946 df-dom 8947 df-sdom 8948 df-fin 8949 df-card 9937 df-pnf 11256 df-mnf 11257 df-xr 11258 df-ltxr 11259 df-le 11260 df-sub 11454 df-neg 11455 df-nn 12245 df-n0 12516 df-xnn0 12589 df-z 12603 df-uz 12874 df-hash 14380 |
| This theorem is used by: hashresfn 14389 dmhashres 14390 hashnn0pnf 14391 hashxrcl 14406 hashgt1 33182 s3clhash 33294 tocyc01 33461 cyc3evpm 33493 cycpmconjslem2 33498 cyc3conja 33500 exsslsb 34010 dimval 34014 dimvalfi 34015 esumcst 34476 hashf2 34497 sseqmw 34805 sseqf 34806 sseqp1 34809 fiblem 34812 fibp1 34815 coinflippv 34898 erdszelem2 35697 erdszelem5 35700 erdszelem7 35702 erdszelem8 35703 |
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