About Working with Variables in Symbolic Expressions
Use the following keywords to perform operations on variables in a symbolic expression:
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substitute—Replaces all occurrences of a variable in an expression with a number, another variable, or an expression.
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assume—Makes assumptions about the domain of a variable, for example, that the variable is an integer or a real number.
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explicit—Clears a previous definition of a variable, so that you can use it as a free variable.