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Mirrors > Home > MPE Home > Th. List > isnum3 | Structured version Visualization version GIF version |
Description: A set is numerable iff it is equinumerous with its cardinal. (Contributed by Mario Carneiro, 29-Apr-2015.) |
Ref | Expression |
---|---|
isnum3 | β’ (π΄ β dom card β (cardβπ΄) β π΄) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cardid2 9894 | . 2 β’ (π΄ β dom card β (cardβπ΄) β π΄) | |
2 | cardon 9885 | . . 3 β’ (cardβπ΄) β On | |
3 | isnumi 9887 | . . 3 β’ (((cardβπ΄) β On β§ (cardβπ΄) β π΄) β π΄ β dom card) | |
4 | 2, 3 | mpan 689 | . 2 β’ ((cardβπ΄) β π΄ β π΄ β dom card) |
5 | 1, 4 | impbii 208 | 1 β’ (π΄ β dom card β (cardβπ΄) β π΄) |
Colors of variables: wff setvar class |
Syntax hints: β wb 205 β wcel 2107 class class class wbr 5106 dom cdm 5634 Oncon0 6318 βcfv 6497 β cen 8883 cardccrd 9876 |
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 5257 ax-nul 5264 ax-pr 5385 |
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 2941 df-ral 3062 df-rex 3071 df-rab 3407 df-v 3446 df-dif 3914 df-un 3916 df-in 3918 df-ss 3928 df-pss 3930 df-nul 4284 df-if 4488 df-pw 4563 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4867 df-int 4909 df-br 5107 df-opab 5169 df-mpt 5190 df-tr 5224 df-id 5532 df-eprel 5538 df-po 5546 df-so 5547 df-fr 5589 df-we 5591 df-xp 5640 df-rel 5641 df-cnv 5642 df-co 5643 df-dm 5644 df-rn 5645 df-res 5646 df-ima 5647 df-ord 6321 df-on 6322 df-iota 6449 df-fun 6499 df-fn 6500 df-f 6501 df-fv 6505 df-en 8887 df-card 9880 |
This theorem is referenced by: ttukey2g 10457 |
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