The mathematical symbol "|" is a discrete mathematical symbol, which limits [x? The equivalent mathematical expression {A|B} of the set with respect to the relation S indicates that the set A is represented, and the value expression of A is B.

So {x | x? -5x+6 = 0} represents the set {x}, and the value range of x is x? -5x+6=0, which means {x =-3 or x =-2}.

Extended data:

The meaning of mathematical symbols:

All human intellectual and cognitive activities are directly or indirectly based on symbols. Contemporary mathematical symbols are formed and developed in a long history. Mathematics becomes easier through symbols, and mathematical symbols accelerate the development of mathematics. It can be said that mathematics is the knowledge of mathematical symbols.

Contemporary mathematical symbols can be roughly divided into four categories: using symbols to represent numbers and quantities; Symbols are used to represent some operation, that is, operation symbols; Use symbols to express a certain relationship, that is, relationship symbols; Just as a symbol.

One of the ways to study mathematical problems is to understand the meaning of mathematical symbols and use them flexibly. In this way, the relationship between variables can be summed up more effectively from practical problems and expressed by mathematical symbols. Using mathematical symbols to express quantitative relations and changing laws is to further show the internal relations of mathematical problems in an abstract way.