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Mirrors > Home > ILE Home > Th. List > 0ct | Unicode version |
Description: The empty set is countable. Remark of [BauerSwan], p. 14:3 which also has the definition of countable used here. (Contributed by Jim Kingdon, 13-Mar-2023.) |
Ref | Expression |
---|---|
0ct |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0lt1o 6345 |
. . . . 5
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2 | djurcl 6945 |
. . . . 5
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3 | 1, 2 | ax-mp 5 |
. . . 4
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4 | 3 | fconst6 5330 |
. . 3
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5 | peano1 4516 |
. . . . 5
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6 | rex0 3385 |
. . . . . . . . 9
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7 | djur 6962 |
. . . . . . . . . . 11
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8 | 7 | biimpi 119 |
. . . . . . . . . 10
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9 | 8 | ord 714 |
. . . . . . . . 9
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10 | 6, 9 | mpi 15 |
. . . . . . . 8
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11 | df1o2 6334 |
. . . . . . . . 9
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12 | 11 | rexeqi 2634 |
. . . . . . . 8
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13 | 10, 12 | sylib 121 |
. . . . . . 7
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14 | 0ex 4063 |
. . . . . . . 8
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15 | fveq2 5429 |
. . . . . . . . 9
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16 | 15 | eqeq2d 2152 |
. . . . . . . 8
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17 | 14, 16 | rexsn 3575 |
. . . . . . 7
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18 | 13, 17 | sylib 121 |
. . . . . 6
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19 | 3 | elexi 2701 |
. . . . . . . 8
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20 | 19 | fvconst2 5644 |
. . . . . . 7
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21 | 5, 20 | ax-mp 5 |
. . . . . 6
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22 | 18, 21 | eqtr4di 2191 |
. . . . 5
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23 | fveq2 5429 |
. . . . . 6
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24 | 23 | rspceeqv 2811 |
. . . . 5
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25 | 5, 22, 24 | sylancr 411 |
. . . 4
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26 | 25 | rgen 2488 |
. . 3
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27 | dffo3 5575 |
. . 3
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28 | 4, 26, 27 | mpbir2an 927 |
. 2
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29 | omex 4515 |
. . . 4
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30 | 19 | snex 4117 |
. . . 4
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31 | 29, 30 | xpex 4662 |
. . 3
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32 | foeq1 5349 |
. . 3
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33 | 31, 32 | spcev 2784 |
. 2
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34 | 28, 33 | ax-mp 5 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-13 1492 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-nul 4062 ax-pow 4106 ax-pr 4139 ax-un 4363 ax-iinf 4510 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1335 df-fal 1338 df-nf 1438 df-sb 1737 df-eu 2003 df-mo 2004 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ral 2422 df-rex 2423 df-v 2691 df-sbc 2914 df-dif 3078 df-un 3080 df-in 3082 df-ss 3089 df-nul 3369 df-pw 3517 df-sn 3538 df-pr 3539 df-op 3541 df-uni 3745 df-int 3780 df-br 3938 df-opab 3998 df-mpt 3999 df-tr 4035 df-id 4223 df-iord 4296 df-on 4298 df-suc 4301 df-iom 4513 df-xp 4553 df-rel 4554 df-cnv 4555 df-co 4556 df-dm 4557 df-rn 4558 df-res 4559 df-iota 5096 df-fun 5133 df-fn 5134 df-f 5135 df-f1 5136 df-fo 5137 df-f1o 5138 df-fv 5139 df-1st 6046 df-2nd 6047 df-1o 6321 df-dju 6931 df-inl 6940 df-inr 6941 |
This theorem is referenced by: enumct 7008 |
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