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2.2.7. Commands and Functions for Data Types
The following are commands and functions for data types:

  * Cast -- type conversion
  * Max, Min -- a maximum or minimum element of a sequence or list
  * Shape -- extended list of types involved in an expression
  * Type -- the data type of an expression
  * TypeOfCoeffs -- type of the coefficients of the current ring
  * Types -- lists all data types

Details can be found by looking up each item by name.  Online, try
'?ItemName' or 'H.Syntax("ItemName")'.