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1.3.1 CoCoA Operators: introduction
In CoCoA there are 5 main types of operators: algebraic operators, relational operators, boolean operators, selection operators, and the range operator. There is also an n-ary operator >< for forming Cartesian products of lists and an operator ::= used in defining rings.

The meaning of an operator depends on the types of its operands; the + in the expression A + B represents the sum of polynomials, or of ideals, or of matrices, etc. according to the type of A and B.