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Mirrors > Home > ILE Home > Th. List > df-ndx | Unicode version |
Description: Define the structure component index extractor. See theorem ndxarg 12019 to understand its purpose. The restriction to ensures that is a set. The restriction to some set is necessary since is a proper class. In principle, we could have chosen or (if we revise all structure component definitions such as df-base 12002) another set such as the set of finite ordinals (df-iom 4512). (Contributed by NM, 4-Sep-2011.) |
Ref | Expression |
---|---|
df-ndx |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cnx 11993 | . 2 | |
2 | cid 4217 | . . 3 | |
3 | cn 8743 | . . 3 | |
4 | 2, 3 | cres 4548 | . 2 |
5 | 1, 4 | wceq 1332 | 1 |
Colors of variables: wff set class |
This definition is referenced by: ndxarg 12019 |
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