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Mirrors > Home > ILE Home > Th. List > peano2nn | Unicode version |
Description: Peano postulate: a successor of a positive integer is a positive integer. (Contributed by NM, 11-Jan-1997.) (Revised by Mario Carneiro, 17-Nov-2014.) |
Ref | Expression |
---|---|
peano2nn |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfnn2 8746 |
. . . . . 6
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2 | 1 | eleq2i 2207 |
. . . . 5
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3 | elintg 3787 |
. . . . 5
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4 | 2, 3 | syl5bb 191 |
. . . 4
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5 | 4 | ibi 175 |
. . 3
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6 | vex 2692 |
. . . . . . . 8
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7 | eleq2 2204 |
. . . . . . . . 9
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8 | eleq2 2204 |
. . . . . . . . . 10
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9 | 8 | raleqbi1dv 2637 |
. . . . . . . . 9
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10 | 7, 9 | anbi12d 465 |
. . . . . . . 8
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11 | 6, 10 | elab 2832 |
. . . . . . 7
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12 | 11 | simprbi 273 |
. . . . . 6
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13 | oveq1 5789 |
. . . . . . . 8
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14 | 13 | eleq1d 2209 |
. . . . . . 7
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15 | 14 | rspcva 2791 |
. . . . . 6
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16 | 12, 15 | sylan2 284 |
. . . . 5
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17 | 16 | expcom 115 |
. . . 4
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18 | 17 | ralimia 2496 |
. . 3
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19 | 5, 18 | syl 14 |
. 2
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20 | nnre 8751 |
. . . 4
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21 | 1red 7805 |
. . . 4
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22 | 20, 21 | readdcld 7819 |
. . 3
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23 | 1 | eleq2i 2207 |
. . . 4
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24 | elintg 3787 |
. . . 4
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25 | 23, 24 | syl5bb 191 |
. . 3
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26 | 22, 25 | syl 14 |
. 2
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27 | 19, 26 | mpbird 166 |
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-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-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-cnex 7735 ax-resscn 7736 ax-1re 7738 ax-addrcl 7741 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1335 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ral 2422 df-rex 2423 df-v 2691 df-un 3080 df-in 3082 df-ss 3089 df-sn 3538 df-pr 3539 df-op 3541 df-uni 3745 df-int 3780 df-br 3938 df-iota 5096 df-fv 5139 df-ov 5785 df-inn 8745 |
This theorem is referenced by: peano2nnd 8759 nnind 8760 nnaddcl 8764 2nn 8905 3nn 8906 4nn 8907 5nn 8908 6nn 8909 7nn 8910 8nn 8911 9nn 8912 nneoor 9177 10nn 9221 nnsplit 9945 fzonn0p1p1 10021 expp1 10331 facp1 10508 resqrexlemfp1 10813 resqrexlemcalc3 10820 trireciplem 11301 trirecip 11302 cvgratnnlemnexp 11325 cvgratz 11333 nno 11639 nnoddm1d2 11643 rplpwr 11751 prmind2 11837 sqrt2irr 11876 |
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