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Mirrors > Home > ILE Home > Th. List > exmidn0m | Unicode version |
Description: Excluded middle is equivalent to any set being empty or inhabited. (Contributed by Jim Kingdon, 5-Mar-2023.) |
Ref | Expression |
---|---|
exmidn0m |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpr 110 |
. . . . 5
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2 | 1 | olcd 735 |
. . . 4
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3 | notm0 3455 |
. . . . . . 7
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4 | 3 | biimpi 120 |
. . . . . 6
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5 | 4 | adantl 277 |
. . . . 5
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6 | 5 | orcd 734 |
. . . 4
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7 | exmidexmid 4208 |
. . . . 5
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8 | exmiddc 837 |
. . . . 5
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9 | 7, 8 | syl 14 |
. . . 4
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10 | 2, 6, 9 | mpjaodan 799 |
. . 3
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11 | 10 | alrimiv 1884 |
. 2
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12 | orc 713 |
. . . . . 6
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13 | 12 | a1d 22 |
. . . . 5
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14 | sssnm 3766 |
. . . . . . . 8
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15 | 14 | biimpa 296 |
. . . . . . 7
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16 | 15 | olcd 735 |
. . . . . 6
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17 | 16 | ex 115 |
. . . . 5
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18 | 13, 17 | jaoi 717 |
. . . 4
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19 | 18 | alimi 1465 |
. . 3
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20 | exmid01 4210 |
. . 3
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21 | 19, 20 | sylibr 134 |
. 2
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22 | 11, 21 | impbii 126 |
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 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 710 ax-5 1457 ax-7 1458 ax-gen 1459 ax-ie1 1503 ax-ie2 1504 ax-8 1514 ax-10 1515 ax-11 1516 ax-i12 1517 ax-bndl 1519 ax-4 1520 ax-17 1536 ax-i9 1540 ax-ial 1544 ax-i5r 1545 ax-14 2161 ax-ext 2169 ax-sep 4133 ax-nul 4141 ax-pow 4186 |
This theorem depends on definitions: df-bi 117 df-dc 836 df-tru 1366 df-fal 1369 df-nf 1471 df-sb 1773 df-clab 2174 df-cleq 2180 df-clel 2183 df-nfc 2318 df-rab 2474 df-v 2751 df-dif 3143 df-in 3147 df-ss 3154 df-nul 3435 df-pw 3589 df-sn 3610 df-exmid 4207 |
This theorem is referenced by: exmidsssn 4214 |
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