# Chapter 3 - Section 3.3 - Properties of Function - 3.3 Assess Your Understanding: 6

increasing

#### Work Step by Step

If a function is increasing in an open interval, then for $x_1, x_2$ that are in the open interval, when $x_2\gt x_1$, $f(x_2) \gt f(x_1)$. Thus, the missing expression in the given statement is: increasing

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