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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 14373? (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 14373 | . 2 ⊢ ♯:V⟶ℕ0* | |
2 | eqid 2735 | . . 3 ⊢ V = V | |
3 | df-xnn0 12598 | . . . 4 ⊢ ℕ0* = (ℕ0 ∪ {+∞}) | |
4 | 3 | eqcomi 2744 | . . 3 ⊢ (ℕ0 ∪ {+∞}) = ℕ0* |
5 | 2, 4 | feq23i 6731 | . 2 ⊢ (♯:V⟶(ℕ0 ∪ {+∞}) ↔ ♯:V⟶ℕ0*) |
6 | 1, 5 | mpbir 231 | 1 ⊢ ♯:V⟶(ℕ0 ∪ {+∞}) |
Colors of variables: wff setvar class |
Syntax hints: Vcvv 3478 ∪ cun 3961 {csn 4631 ⟶wf 6559 +∞cpnf 11290 ℕ0cn0 12524 ℕ0*cxnn0 12597 ♯chash 14366 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 ax-cnex 11209 ax-resscn 11210 ax-1cn 11211 ax-icn 11212 ax-addcl 11213 ax-addrcl 11214 ax-mulcl 11215 ax-mulrcl 11216 ax-mulcom 11217 ax-addass 11218 ax-mulass 11219 ax-distr 11220 ax-i2m1 11221 ax-1ne0 11222 ax-1rid 11223 ax-rnegex 11224 ax-rrecex 11225 ax-cnre 11226 ax-pre-lttri 11227 ax-pre-lttrn 11228 ax-pre-ltadd 11229 ax-pre-mulgt0 11230 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-pss 3983 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-op 4638 df-uni 4913 df-int 4952 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5583 df-eprel 5589 df-po 5597 df-so 5598 df-fr 5641 df-we 5643 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-pred 6323 df-ord 6389 df-on 6390 df-lim 6391 df-suc 6392 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-om 7888 df-2nd 8014 df-frecs 8305 df-wrecs 8336 df-recs 8410 df-rdg 8449 df-1o 8505 df-er 8744 df-en 8985 df-dom 8986 df-sdom 8987 df-fin 8988 df-card 9977 df-pnf 11295 df-mnf 11296 df-xr 11297 df-ltxr 11298 df-le 11299 df-sub 11492 df-neg 11493 df-nn 12265 df-n0 12525 df-xnn0 12598 df-z 12612 df-uz 12877 df-hash 14367 |
This theorem is referenced by: hashresfn 14376 dmhashres 14377 hashnn0pnf 14378 hashxrcl 14393 hashgt1 32818 s3clhash 32917 tocyc01 33121 cyc3evpm 33153 cycpmconjslem2 33158 cyc3conja 33160 dimval 33628 dimvalfi 33629 esumcst 34044 hashf2 34065 sseqmw 34373 sseqf 34374 sseqp1 34377 fiblem 34380 fibp1 34383 coinflippv 34465 erdszelem2 35177 erdszelem5 35180 erdszelem7 35182 erdszelem8 35183 |
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