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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 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-dif 3068 | . 2 | |
2 | df-rab 2423 | . 2 | |
3 | 1, 2 | eqtr4i 2161 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wa 103 wceq 1331 wcel 1480 cab 2123 crab 2418 cdif 3063 |
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 1423 ax-gen 1425 ax-4 1487 ax-17 1506 ax-ext 2119 |
This theorem depends on definitions: df-bi 116 df-cleq 2130 df-rab 2423 df-dif 3068 |
This theorem is referenced by: dfdif3 3181 difeq1 3182 difeq2 3183 nfdif 3192 difidALT 3427 |
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