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Mirrors > Home > ILE Home > Th. List > abeq0 | Unicode version |
Description: Condition for a class abstraction to be empty. (Contributed by Jim Kingdon, 12-Aug-2018.) |
Ref | Expression |
---|---|
abeq0 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sbn 1964 |
. . 3
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2 | 1 | albii 1481 |
. 2
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3 | nfv 1539 |
. . 3
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4 | 3 | sb8 1867 |
. 2
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5 | eq0 3456 |
. . 3
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6 | df-clab 2176 |
. . . . 5
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7 | 6 | notbii 669 |
. . . 4
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8 | 7 | albii 1481 |
. . 3
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9 | 5, 8 | bitri 184 |
. 2
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10 | 2, 4, 9 | 3bitr4ri 213 |
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 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-ext 2171 |
This theorem depends on definitions: df-bi 117 df-tru 1367 df-fal 1370 df-nf 1472 df-sb 1774 df-clab 2176 df-cleq 2182 df-clel 2185 df-nfc 2321 df-v 2754 df-dif 3146 df-nul 3438 |
This theorem is referenced by: opprc 3814 |
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