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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 13700? (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 13700 | . 2 ⊢ ♯:V⟶ℕ0* | |
2 | eqid 2823 | . . 3 ⊢ V = V | |
3 | df-xnn0 11971 | . . . 4 ⊢ ℕ0* = (ℕ0 ∪ {+∞}) | |
4 | 3 | eqcomi 2832 | . . 3 ⊢ (ℕ0 ∪ {+∞}) = ℕ0* |
5 | 2, 4 | feq23i 6510 | . 2 ⊢ (♯:V⟶(ℕ0 ∪ {+∞}) ↔ ♯:V⟶ℕ0*) |
6 | 1, 5 | mpbir 233 | 1 ⊢ ♯:V⟶(ℕ0 ∪ {+∞}) |
Colors of variables: wff setvar class |
Syntax hints: Vcvv 3496 ∪ cun 3936 {csn 4569 ⟶wf 6353 +∞cpnf 10674 ℕ0cn0 11900 ℕ0*cxnn0 11970 ♯chash 13693 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-cnex 10595 ax-resscn 10596 ax-1cn 10597 ax-icn 10598 ax-addcl 10599 ax-addrcl 10600 ax-mulcl 10601 ax-mulrcl 10602 ax-mulcom 10603 ax-addass 10604 ax-mulass 10605 ax-distr 10606 ax-i2m1 10607 ax-1ne0 10608 ax-1rid 10609 ax-rnegex 10610 ax-rrecex 10611 ax-cnre 10612 ax-pre-lttri 10613 ax-pre-lttrn 10614 ax-pre-ltadd 10615 ax-pre-mulgt0 10616 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-nel 3126 df-ral 3145 df-rex 3146 df-reu 3147 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-pss 3956 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-tp 4574 df-op 4576 df-uni 4841 df-int 4879 df-iun 4923 df-br 5069 df-opab 5131 df-mpt 5149 df-tr 5175 df-id 5462 df-eprel 5467 df-po 5476 df-so 5477 df-fr 5516 df-we 5518 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-pred 6150 df-ord 6196 df-on 6197 df-lim 6198 df-suc 6199 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-f1 6362 df-fo 6363 df-f1o 6364 df-fv 6365 df-riota 7116 df-ov 7161 df-oprab 7162 df-mpo 7163 df-om 7583 df-wrecs 7949 df-recs 8010 df-rdg 8048 df-er 8291 df-en 8512 df-dom 8513 df-sdom 8514 df-fin 8515 df-card 9370 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-le 10683 df-sub 10874 df-neg 10875 df-nn 11641 df-n0 11901 df-xnn0 11971 df-z 11985 df-uz 12247 df-hash 13694 |
This theorem is referenced by: hashresfn 13703 dmhashres 13704 hashnn0pnf 13705 hashxrcl 13721 hashgt1 30532 s3clhash 30626 tocyc01 30762 cyc3evpm 30794 cycpmconjslem2 30799 cyc3conja 30801 dimval 31003 dimvalfi 31004 esumcst 31324 hashf2 31345 sseqmw 31651 sseqf 31652 sseqp1 31655 fiblem 31658 fibp1 31661 coinflippv 31743 erdszelem2 32441 erdszelem5 32444 erdszelem7 32446 erdszelem8 32447 |
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