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Mirrors > Home > ILE Home > Th. List > dfdif2 | Unicode version |
Description: Alternate definition of class difference. (Contributed by NM, 25-Mar-2004.) |
Ref | Expression |
---|---|
dfdif2 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-dif 3078 |
. 2
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2 | df-rab 2426 |
. 2
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3 | 1, 2 | eqtr4i 2164 |
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-5 1424 ax-gen 1426 ax-4 1488 ax-17 1507 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-cleq 2133 df-rab 2426 df-dif 3078 |
This theorem is referenced by: dfdif3 3191 difeq1 3192 difeq2 3193 nfdif 3202 difidALT 3437 |
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