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7.2.3.3 module operations (plural)

+
addition (concatenation of the generators and simplification) Note that "-" implicitely converts a module into a matrix; see below example.

*
right or left multiplication with number, ideal, or poly (but not `module` * `module`!)

module_expression [ int_expression , int_expression ]
is a module entry, where the first index indicates the row and the second the column

module_expressions [ int_expression ]
is a vector, where the index indicates the column (generator)


Example:
 


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