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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 14343? (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 14343 | . 2 ⊢ ♯:V⟶ℕ0* | |
| 2 | eqid 2761 | . . 3 ⊢ V = V | |
| 3 | df-xnn0 12548 | . . . 4 ⊢ ℕ0* = (ℕ0 ∪ {+∞}) | |
| 4 | 3 | eqcomi 2770 | . . 3 ⊢ (ℕ0 ∪ {+∞}) = ℕ0* |
| 5 | 2, 4 | feq23i 6679 | . 2 ⊢ (♯:V⟶(ℕ0 ∪ {+∞}) ↔ ♯:V⟶ℕ0*) |
| 6 | 1, 5 | mpbir 233 | 1 ⊢ ♯:V⟶(ℕ0 ∪ {+∞}) |
| Colors of variables: wff setvar class |
| Syntax hints: Vcvv 3453 ∪ cun 3900 {csn 4579 ⟶wf 6511 +∞cpnf 11206 ℕ0cn0 12474 ℕ0*cxnn0 12547 ♯chash 14336 |
| 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 5243 ax-nul 5253 ax-pow 5319 ax-pr 5387 ax-un 7712 ax-cnex 11122 ax-resscn 11123 ax-1cn 11124 ax-icn 11125 ax-addcl 11126 ax-addrcl 11127 ax-mulcl 11128 ax-mulrcl 11129 ax-mulcom 11130 ax-addass 11131 ax-mulass 11132 ax-distr 11133 ax-i2m1 11134 ax-1ne0 11135 ax-1rid 11136 ax-rnegex 11137 ax-rrecex 11138 ax-cnre 11139 ax-pre-lttri 11140 ax-pre-lttrn 11141 ax-pre-ltadd 11142 ax-pre-mulgt0 11143 |
| 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 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4863 df-int 4903 df-iun 4948 df-br 5098 df-opab 5160 df-mpt 5179 df-tr 5205 df-id 5538 df-eprel 5543 df-po 5551 df-so 5552 df-fr 5596 df-we 5598 df-xp 5649 df-rel 5650 df-cnv 5651 df-co 5652 df-dm 5653 df-rn 5654 df-res 5655 df-ima 5656 df-pred 6282 df-ord 6343 df-on 6344 df-lim 6345 df-suc 6346 df-iota 6471 df-fun 6517 df-fn 6518 df-f 6519 df-f1 6520 df-fo 6521 df-f1o 6522 df-fv 6523 df-riota 7347 df-ov 7393 df-oprab 7394 df-mpo 7395 df-om 7841 df-2nd 7965 df-frecs 8255 df-wrecs 8286 df-recs 8335 df-rdg 8374 df-1o 8430 df-er 8671 df-en 8921 df-dom 8922 df-sdom 8923 df-fin 8924 df-card 9890 df-pnf 11211 df-mnf 11212 df-xr 11213 df-ltxr 11214 df-le 11215 df-sub 11409 df-neg 11410 df-nn 12204 df-n0 12475 df-xnn0 12548 df-z 12562 df-uz 12833 df-hash 14337 |
| This theorem is referenced by: hashresfn 14346 dmhashres 14347 hashnn0pnf 14348 hashxrcl 14363 hashgt1 32970 s3clhash 33086 tocyc01 33258 cyc3evpm 33290 cycpmconjslem2 33295 cyc3conja 33297 exsslsb 33854 dimval 33858 dimvalfi 33859 esumcst 34320 hashf2 34341 sseqmw 34648 sseqf 34649 sseqp1 34652 fiblem 34655 fibp1 34658 coinflippv 34741 erdszelem2 35502 erdszelem5 35505 erdszelem7 35507 erdszelem8 35508 |
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