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| Mirrors > Home > MPE Home > Th. List > ficardid | Structured version Visualization version GIF version | ||
| Description: A finite set is equinumerous to its cardinal number. (Contributed by Mario Carneiro, 21-Sep-2013.) |
| Ref | Expression |
|---|---|
| ficardid | ⊢ (𝐴 ∈ Fin → (card‘𝐴) ≈ 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | finnum 9907 | . 2 ⊢ (𝐴 ∈ Fin → 𝐴 ∈ dom card) | |
| 2 | cardid2 9912 | . 2 ⊢ (𝐴 ∈ dom card → (card‘𝐴) ≈ 𝐴) | |
| 3 | 1, 2 | syl 17 | 1 ⊢ (𝐴 ∈ Fin → (card‘𝐴) ≈ 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2109 class class class wbr 5109 dom cdm 5640 ‘cfv 6513 ≈ cen 8917 Fincfn 8920 cardccrd 9894 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-sep 5253 ax-nul 5263 ax-pow 5322 ax-pr 5389 ax-un 7713 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-ral 3046 df-rex 3055 df-rab 3409 df-v 3452 df-dif 3919 df-un 3921 df-in 3923 df-ss 3933 df-pss 3936 df-nul 4299 df-if 4491 df-pw 4567 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4874 df-int 4913 df-br 5110 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5535 df-eprel 5540 df-po 5548 df-so 5549 df-fr 5593 df-we 5595 df-xp 5646 df-rel 5647 df-cnv 5648 df-co 5649 df-dm 5650 df-rn 5651 df-res 5652 df-ima 5653 df-ord 6337 df-on 6338 df-iota 6466 df-fun 6515 df-fn 6516 df-f 6517 df-f1 6518 df-fo 6519 df-f1o 6520 df-fv 6521 df-om 7845 df-er 8673 df-en 8921 df-fin 8924 df-card 9898 |
| This theorem is referenced by: isinffi 9951 finnisoeu 10072 ficardadju 10159 ackbij1lem5 10182 ackbij1lem9 10186 ackbij1b 10197 ackbij2lem2 10198 fin1a2lem11 10369 mreexexd 17615 |
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