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Mirrors > Home > ILE Home > Th. List > disjdif2 | Unicode version |
Description: The difference of a class and a class disjoint from it is the original class. (Contributed by BJ, 21-Apr-2019.) |
Ref | Expression |
---|---|
disjdif2 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | difeq2 3261 |
. 2
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2 | difin 3386 |
. 2
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3 | dif0 3507 |
. 2
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4 | 1, 2, 3 | 3eqtr3g 2244 |
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 1457 ax-7 1458 ax-gen 1459 ax-ie1 1503 ax-ie2 1504 ax-8 1514 ax-10 1515 ax-11 1516 ax-i12 1517 ax-bndl 1519 ax-4 1520 ax-17 1536 ax-i9 1540 ax-ial 1544 ax-i5r 1545 ax-ext 2170 |
This theorem depends on definitions: df-bi 117 df-tru 1366 df-fal 1369 df-nf 1471 df-sb 1773 df-clab 2175 df-cleq 2181 df-clel 2184 df-nfc 2320 df-ral 2472 df-rab 2476 df-v 2753 df-dif 3145 df-in 3149 df-ss 3156 df-nul 3437 |
This theorem is referenced by: setsfun0 12515 |
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