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Mirrors > Home > ILE Home > Th. List > dfss | Unicode version |
Description: Variant of subclass definition df-ss 3166. (Contributed by NM, 3-Sep-2004.) |
Ref | Expression |
---|---|
dfss |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ss 3166 |
. 2
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2 | eqcom 2195 |
. 2
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3 | 1, 2 | bitri 184 |
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-5 1458 ax-gen 1460 ax-ext 2175 |
This theorem depends on definitions: df-bi 117 df-cleq 2186 df-ss 3166 |
This theorem is referenced by: dfss2 3168 onelini 4459 cnvcnv 5114 funimass1 5327 sbthlemi5 7014 dmaddpi 7379 dmmulpi 7380 tgioo 14695 |
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