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Mirrors > Home > ILE Home > Th. List > csbprc | Unicode version |
Description: The proper substitution of a proper class for a set into a class results in the empty set. (Contributed by NM, 17-Aug-2018.) |
Ref | Expression |
---|---|
csbprc |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-csb 3008 |
. 2
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2 | sbcex 2921 |
. . . . . . 7
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3 | 2 | con3i 622 |
. . . . . 6
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4 | 3 | pm2.21d 609 |
. . . . 5
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5 | falim 1346 |
. . . . 5
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6 | 4, 5 | impbid1 141 |
. . . 4
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7 | 6 | abbidv 2258 |
. . 3
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8 | fal 1339 |
. . . 4
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9 | 8 | abf 3411 |
. . 3
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10 | 7, 9 | eqtrdi 2189 |
. 2
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11 | 1, 10 | syl5eq 2185 |
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-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-tru 1335 df-fal 1338 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-v 2691 df-sbc 2914 df-csb 3008 df-dif 3078 df-in 3082 df-ss 3089 df-nul 3369 |
This theorem is referenced by: (None) |
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