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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 14522? (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 14522 | . 2 ⊢ ♯:V⟶ℕ0* | |
| 2 | eqid 2763 | . . 3 ⊢ V = V | |
| 3 | df-xnn0 12720 | . . . 4 ⊢ ℕ0* = (ℕ0 ∪ {+∞}) | |
| 4 | 3 | eqcomi 2772 | . . 3 ⊢ (ℕ0 ∪ {+∞}) = ℕ0* |
| 5 | 2, 4 | feq23i 6733 | . 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 3454 ∪ cun 4152 {csn 4588 ⟶wf 6562 +∞cpnf 11379 ℕ0cn0 12646 ℕ0*cxnn0 12719 ♯chash 14515 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5255 ax-nul 5266 ax-pow 5334 ax-pr 5398 ax-un 7783 ax-cnex 11295 ax-resscn 11296 ax-1cn 11297 ax-icn 11298 ax-addcl 11299 ax-addrcl 11300 ax-mulcl 11301 ax-mulrcl 11302 ax-mulcom 11303 ax-addass 11304 ax-mulass 11305 ax-distr 11306 ax-i2m1 11307 ax-1ne0 11308 ax-1rid 11309 ax-rnegex 11310 ax-rrecex 11311 ax-cnre 11312 ax-pre-lttri 11313 ax-pre-lttrn 11314 ax-pre-ltadd 11315 ax-pre-mulgt0 11316 |
| 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 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-int 4913 df-iun 4958 df-br 5109 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5553 df-eprel 5558 df-po 5566 df-so 5567 df-fr 5611 df-we 5613 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-pred 6330 df-ord 6391 df-on 6392 df-lim 6393 df-suc 6394 df-iota 6520 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 df-riota 7408 df-ov 7454 df-oprab 7455 df-mpo 7456 df-om 7912 df-2nd 8036 df-frecs 8337 df-wrecs 8368 df-recs 8417 df-rdg 8456 df-1o 8514 df-er 8755 df-en 9012 df-dom 9013 df-sdom 9014 df-fin 9015 df-card 10057 df-pnf 11384 df-mnf 11385 df-xr 11386 df-ltxr 11387 df-le 11388 df-sub 11582 df-neg 11583 df-nn 12376 df-n0 12647 df-xnn0 12720 df-z 12734 df-uz 13006 df-hash 14516 |
| This theorem is used by: hashresfn 14525 dmhashres 14526 hashnn0pnf 14527 hashxrcl 14542 hashgt1 33496 s3clhash 33608 tocyc01 33778 cyc3evpm 33810 cycpmconjslem2 33815 cyc3conja 33817 exsslsb 34340 dimval 34344 dimvalfi 34345 esumcst 34806 hashf2 34827 sseqmw 35134 sseqf 35135 sseqp1 35138 fiblem 35141 fibp1 35144 coinflippv 35227 erdszelem2 36165 erdszelem5 36168 erdszelem7 36170 erdszelem8 36171 |
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