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Mirrors > Home > ILE Home > Th. List > dfss | Unicode version |
Description: Variant of subclass definition df-ss 3048. (Contributed by NM, 3-Sep-2004.) |
Ref | Expression |
---|---|
dfss |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ss 3048 |
. 2
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2 | eqcom 2115 |
. 2
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3 | 1, 2 | bitri 183 |
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-5 1404 ax-gen 1406 ax-ext 2095 |
This theorem depends on definitions: df-bi 116 df-cleq 2106 df-ss 3048 |
This theorem is referenced by: dfss2 3050 onelini 4310 cnvcnv 4947 funimass1 5156 sbthlemi5 6799 dmaddpi 7075 dmmulpi 7076 tgioo 12526 |
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