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Mirrors > Home > ILE Home > Th. List > onunsnss | Unicode version |
Description: Adding a singleton to create an ordinal. (Contributed by Jim Kingdon, 20-Oct-2021.) |
Ref | Expression |
---|---|
onunsnss |
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elirr 4284 |
. . . . 5
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2 | elsni 3416 |
. . . . . . . 8
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3 | 2 | adantl 271 |
. . . . . . 7
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4 | simplr 496 |
. . . . . . 7
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5 | 3, 4 | eqeltrrd 2156 |
. . . . . 6
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6 | 5 | ex 113 |
. . . . 5
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7 | 1, 6 | mtoi 622 |
. . . 4
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8 | snidg 3423 |
. . . . . . . . 9
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9 | elun2 3140 |
. . . . . . . . 9
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10 | 8, 9 | syl 14 |
. . . . . . . 8
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11 | 10 | adantr 270 |
. . . . . . 7
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12 | ontr1 4144 |
. . . . . . . 8
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13 | 12 | adantl 271 |
. . . . . . 7
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14 | 11, 13 | mpan2d 418 |
. . . . . 6
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15 | 14 | imp 122 |
. . . . 5
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16 | elun 3113 |
. . . . 5
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17 | 15, 16 | sylib 120 |
. . . 4
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18 | 7, 17 | ecased 1280 |
. . 3
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19 | 18 | ex 113 |
. 2
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20 | 19 | ssrdv 3005 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-setind 4280 |
This theorem depends on definitions: df-bi 115 df-3an 921 df-tru 1287 df-nf 1390 df-sb 1686 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-ne 2246 df-ral 2353 df-rex 2354 df-v 2603 df-dif 2975 df-un 2977 df-in 2979 df-ss 2986 df-sn 3404 df-uni 3602 df-tr 3876 df-iord 4121 df-on 4123 |
This theorem is referenced by: (None) |
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