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Mirrors > Home > ILE Home > Th. List > expap0 | Unicode version |
Description: Positive integer exponentiation is apart from zero iff its base is apart from zero. That it is easier to prove this first, and then prove expeq0 10524 in terms of it, rather than the other way around, is perhaps an illustration of the maxim "In constructive analysis, the apartness is more basic [ than ] equality." (Remark of [Geuvers], p. 1). (Contributed by Jim Kingdon, 10-Jun-2020.) |
Ref | Expression |
---|---|
expap0 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | oveq2 5876 |
. . . . . 6
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2 | 1 | breq1d 4010 |
. . . . 5
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3 | 2 | bibi1d 233 |
. . . 4
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4 | 3 | imbi2d 230 |
. . 3
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5 | oveq2 5876 |
. . . . . 6
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6 | 5 | breq1d 4010 |
. . . . 5
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7 | 6 | bibi1d 233 |
. . . 4
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8 | 7 | imbi2d 230 |
. . 3
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9 | oveq2 5876 |
. . . . . 6
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10 | 9 | breq1d 4010 |
. . . . 5
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11 | 10 | bibi1d 233 |
. . . 4
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12 | 11 | imbi2d 230 |
. . 3
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13 | oveq2 5876 |
. . . . . 6
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14 | 13 | breq1d 4010 |
. . . . 5
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15 | 14 | bibi1d 233 |
. . . 4
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16 | 15 | imbi2d 230 |
. . 3
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17 | exp1 10499 |
. . . 4
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | |
18 | 17 | breq1d 4010 |
. . 3
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
19 | nnnn0 9159 |
. . . . . . . . 9
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | |
20 | expp1 10500 |
. . . . . . . . . . 11
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21 | 20 | breq1d 4010 |
. . . . . . . . . 10
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22 | 21 | ancoms 268 |
. . . . . . . . 9
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23 | 19, 22 | sylan 283 |
. . . . . . . 8
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24 | 23 | adantr 276 |
. . . . . . 7
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25 | simplr 528 |
. . . . . . . . 9
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26 | 19 | ad2antrr 488 |
. . . . . . . . 9
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27 | expcl 10511 |
. . . . . . . . 9
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28 | 25, 26, 27 | syl2anc 411 |
. . . . . . . 8
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29 | 28, 25 | mulap0bd 8590 |
. . . . . . 7
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30 | anbi1 466 |
. . . . . . . 8
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | |
31 | 30 | adantl 277 |
. . . . . . 7
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32 | 24, 29, 31 | 3bitr2d 216 |
. . . . . 6
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33 | anidm 396 |
. . . . . 6
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | |
34 | 32, 33 | bitrdi 196 |
. . . . 5
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35 | 34 | exp31 364 |
. . . 4
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36 | 35 | a2d 26 |
. . 3
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37 | 4, 8, 12, 16, 18, 36 | nnind 8911 |
. 2
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38 | 37 | impcom 125 |
1
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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 106 ax-ia2 107 ax-ia3 108 ax-in1 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-13 2150 ax-14 2151 ax-ext 2159 ax-coll 4115 ax-sep 4118 ax-nul 4126 ax-pow 4171 ax-pr 4205 ax-un 4429 ax-setind 4532 ax-iinf 4583 ax-cnex 7880 ax-resscn 7881 ax-1cn 7882 ax-1re 7883 ax-icn 7884 ax-addcl 7885 ax-addrcl 7886 ax-mulcl 7887 ax-mulrcl 7888 ax-addcom 7889 ax-mulcom 7890 ax-addass 7891 ax-mulass 7892 ax-distr 7893 ax-i2m1 7894 ax-0lt1 7895 ax-1rid 7896 ax-0id 7897 ax-rnegex 7898 ax-precex 7899 ax-cnre 7900 ax-pre-ltirr 7901 ax-pre-ltwlin 7902 ax-pre-lttrn 7903 ax-pre-apti 7904 ax-pre-ltadd 7905 ax-pre-mulgt0 7906 ax-pre-mulext 7907 |
This theorem depends on definitions: df-bi 117 df-dc 835 df-3or 979 df-3an 980 df-tru 1356 df-fal 1359 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ne 2348 df-nel 2443 df-ral 2460 df-rex 2461 df-reu 2462 df-rmo 2463 df-rab 2464 df-v 2739 df-sbc 2963 df-csb 3058 df-dif 3131 df-un 3133 df-in 3135 df-ss 3142 df-nul 3423 df-if 3535 df-pw 3576 df-sn 3597 df-pr 3598 df-op 3600 df-uni 3808 df-int 3843 df-iun 3886 df-br 4001 df-opab 4062 df-mpt 4063 df-tr 4099 df-id 4289 df-po 4292 df-iso 4293 df-iord 4362 df-on 4364 df-ilim 4365 df-suc 4367 df-iom 4586 df-xp 4628 df-rel 4629 df-cnv 4630 df-co 4631 df-dm 4632 df-rn 4633 df-res 4634 df-ima 4635 df-iota 5173 df-fun 5213 df-fn 5214 df-f 5215 df-f1 5216 df-fo 5217 df-f1o 5218 df-fv 5219 df-riota 5824 df-ov 5871 df-oprab 5872 df-mpo 5873 df-1st 6134 df-2nd 6135 df-recs 6299 df-frec 6385 df-pnf 7971 df-mnf 7972 df-xr 7973 df-ltxr 7974 df-le 7975 df-sub 8107 df-neg 8108 df-reap 8509 df-ap 8516 df-div 8606 df-inn 8896 df-n0 9153 df-z 9230 df-uz 9505 df-seqfrec 10419 df-exp 10493 |
This theorem is referenced by: expeq0 10524 abs00ap 11042 |
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