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Mirrors > Home > MPE Home > Th. List > cardnn | Structured version Visualization version GIF version |
Description: The cardinality of a natural number is the number. Corollary 10.23 of [TakeutiZaring] p. 90. (Contributed by Mario Carneiro, 7-Jan-2013.) |
Ref | Expression |
---|---|
cardnn | β’ (π΄ β Ο β (cardβπ΄) = π΄) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nnon 7861 | . . 3 β’ (π΄ β Ο β π΄ β On) | |
2 | onenon 9944 | . . 3 β’ (π΄ β On β π΄ β dom card) | |
3 | cardid2 9948 | . . 3 β’ (π΄ β dom card β (cardβπ΄) β π΄) | |
4 | 1, 2, 3 | 3syl 18 | . 2 β’ (π΄ β Ο β (cardβπ΄) β π΄) |
5 | nnfi 9167 | . . . 4 β’ (π΄ β Ο β π΄ β Fin) | |
6 | ficardom 9956 | . . . 4 β’ (π΄ β Fin β (cardβπ΄) β Ο) | |
7 | 5, 6 | syl 17 | . . 3 β’ (π΄ β Ο β (cardβπ΄) β Ο) |
8 | nneneq 9209 | . . 3 β’ (((cardβπ΄) β Ο β§ π΄ β Ο) β ((cardβπ΄) β π΄ β (cardβπ΄) = π΄)) | |
9 | 7, 8 | mpancom 687 | . 2 β’ (π΄ β Ο β ((cardβπ΄) β π΄ β (cardβπ΄) = π΄)) |
10 | 4, 9 | mpbid 231 | 1 β’ (π΄ β Ο β (cardβπ΄) = π΄) |
Colors of variables: wff setvar class |
Syntax hints: β wi 4 β wb 205 = wceq 1542 β wcel 2107 class class class wbr 5149 dom cdm 5677 Oncon0 6365 βcfv 6544 Οcom 7855 β cen 8936 Fincfn 8939 cardccrd 9930 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-ral 3063 df-rex 3072 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-int 4952 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-om 7856 df-1o 8466 df-er 8703 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-card 9934 |
This theorem is referenced by: card1 9963 cardennn 9978 cardsucnn 9980 nnsdomel 9985 pm54.43lem 9995 iscard3 10088 nnadju 10192 nnadjuALT 10193 ficardun 10195 ficardunOLD 10196 ficardun2 10197 ficardun2OLD 10198 pwsdompw 10199 ackbij2 10238 sdom2en01 10297 fin23lem22 10322 fin1a2lem9 10403 ficard 10560 cfpwsdom 10579 cardfz 13935 hashgval2 14338 hashdom 14339 |
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