
Concept explainers
To explain:The reason why an open sentence always has at least one variable.

Answer to Problem 66HP
Thereason why an open sentence always has at least one variable is that an open sentence is a statement that contains at least one unknown quantity and that becomes true of false.
Explanation of Solution
Calculation:
By definition, an open sentence is a statement that contains at least one unknown quantity and that becomes true of false when a quantity is substituted for the unknown.
Therefore, the reason why an open sentence always has at least one variable is that an open sentence is a statement that contains at least one unknown quantity and that becomes true of false.
Chapter 1 Solutions
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