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Mirrors > Home > ILE Home > Th. List > dfss4st | Unicode version |
Description: Subclass defined in terms of class difference. (Contributed by NM, 22-Mar-1998.) (Proof shortened by Andrew Salmon, 26-Jun-2011.) |
Ref | Expression |
---|---|
dfss4st |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq1w 2201 |
. . . 4
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2 | 1 | stbid 818 |
. . 3
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3 | 2 | cbvalv 1890 |
. 2
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4 | sseqin2 3300 |
. . 3
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5 | nfa1 1522 |
. . . . 5
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6 | nfcv 2282 |
. . . . 5
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7 | nfcv 2282 |
. . . . 5
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8 | eldif 3085 |
. . . . . . 7
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9 | eldif 3085 |
. . . . . . . . . 10
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10 | 9 | notbii 658 |
. . . . . . . . 9
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11 | 10 | anbi2i 453 |
. . . . . . . 8
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12 | elin 3264 |
. . . . . . . . . 10
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13 | abai 550 |
. . . . . . . . . 10
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14 | 12, 13 | bitri 183 |
. . . . . . . . 9
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15 | imanst 874 |
. . . . . . . . . 10
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16 | 15 | anbi2d 460 |
. . . . . . . . 9
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17 | 14, 16 | syl5bb 191 |
. . . . . . . 8
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18 | 11, 17 | bitr4id 198 |
. . . . . . 7
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19 | 8, 18 | syl5bb 191 |
. . . . . 6
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20 | 19 | sps 1518 |
. . . . 5
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21 | 5, 6, 7, 20 | eqrd 3120 |
. . . 4
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22 | 21 | eqeq1d 2149 |
. . 3
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23 | 4, 22 | bitr4id 198 |
. 2
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
24 | 3, 23 | sylbi 120 |
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 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-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-stab 817 df-tru 1335 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-v 2691 df-dif 3078 df-in 3082 df-ss 3089 |
This theorem is referenced by: sbthlemi3 6855 |
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