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Mirrors > Home > MPE Home > Th. List > cardidg | Structured version Visualization version GIF version |
Description: Any set is equinumerous to its cardinal number. Closed theorem form of cardid 9955. (Contributed by David Moews, 1-May-2017.) |
Ref | Expression |
---|---|
cardidg | ⊢ (𝐴 ∈ 𝐵 → (card‘𝐴) ≈ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elex 3504 | . 2 ⊢ (𝐴 ∈ 𝐵 → 𝐴 ∈ V) | |
2 | cardeqv 9877 | . . . 4 ⊢ dom card = V | |
3 | 2 | eleq2i 2904 | . . 3 ⊢ (𝐴 ∈ dom card ↔ 𝐴 ∈ V) |
4 | cardid2 9368 | . . 3 ⊢ (𝐴 ∈ dom card → (card‘𝐴) ≈ 𝐴) | |
5 | 3, 4 | sylbir 237 | . 2 ⊢ (𝐴 ∈ V → (card‘𝐴) ≈ 𝐴) |
6 | 1, 5 | syl 17 | 1 ⊢ (𝐴 ∈ 𝐵 → (card‘𝐴) ≈ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2114 Vcvv 3486 class class class wbr 5052 dom cdm 5541 ‘cfv 6341 ≈ cen 8492 cardccrd 9350 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-rep 5176 ax-sep 5189 ax-nul 5196 ax-pow 5252 ax-pr 5316 ax-un 7447 ax-ac2 9871 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3488 df-sbc 3764 df-csb 3872 df-dif 3927 df-un 3929 df-in 3931 df-ss 3940 df-pss 3942 df-nul 4280 df-if 4454 df-pw 4527 df-sn 4554 df-pr 4556 df-tp 4558 df-op 4560 df-uni 4825 df-int 4863 df-iun 4907 df-br 5053 df-opab 5115 df-mpt 5133 df-tr 5159 df-id 5446 df-eprel 5451 df-po 5460 df-so 5461 df-fr 5500 df-se 5501 df-we 5502 df-xp 5547 df-rel 5548 df-cnv 5549 df-co 5550 df-dm 5551 df-rn 5552 df-res 5553 df-ima 5554 df-pred 6134 df-ord 6180 df-on 6181 df-suc 6183 df-iota 6300 df-fun 6343 df-fn 6344 df-f 6345 df-f1 6346 df-fo 6347 df-f1o 6348 df-fv 6349 df-isom 6350 df-riota 7100 df-wrecs 7933 df-recs 7994 df-en 8496 df-card 9354 df-ac 9528 |
This theorem is referenced by: cardidd 9957 tskcard 10189 tskuni 10191 |
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