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A database table can be thought of as consisting of rows and columns. [1] Each row in a table represents a set of related data, and every row in the table has the same structure. For example, in a table that represents companies, each row might represent a single company. Columns might represent things like company name, address, etc.
If = {:} then is the index set of . In general is an index set if for every , with (i.e. they index the same function), we have . Intuitively, these are the sets of ...
A fuzzy set is a pair (,) where is a set (often required to be non-empty) and : [,] a membership function. The reference set U {\displaystyle U} (sometimes denoted by Ω {\displaystyle \Omega } or X {\displaystyle X} ) is called universe of discourse , and for each x ∈ U , {\displaystyle x\in U,} the value m ( x ) {\displaystyle m(x)} is ...