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Mirrors > Home > ILE Home > Th. List > snexprc | Unicode version |
Description: A singleton whose element
is a proper class is a set. The ![]() ![]() ![]() ![]() |
Ref | Expression |
---|---|
snexprc |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | snprc 3535 |
. . 3
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2 | 1 | biimpi 119 |
. 2
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3 | 0ex 3995 |
. 2
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4 | 2, 3 | syl6eqel 2190 |
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 105 ax-ia2 106 ax-ia3 107 ax-in1 584 ax-in2 585 ax-io 671 ax-5 1391 ax-7 1392 ax-gen 1393 ax-ie1 1437 ax-ie2 1438 ax-8 1450 ax-10 1451 ax-11 1452 ax-i12 1453 ax-bndl 1454 ax-4 1455 ax-17 1474 ax-i9 1478 ax-ial 1482 ax-i5r 1483 ax-ext 2082 ax-nul 3994 |
This theorem depends on definitions: df-bi 116 df-tru 1302 df-fal 1305 df-nf 1405 df-sb 1704 df-clab 2087 df-cleq 2093 df-clel 2096 df-nfc 2229 df-v 2643 df-dif 3023 df-nul 3311 df-sn 3480 |
This theorem is referenced by: notnotsnex 4051 |
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