## Review

Key Concepts

 base independent variable better set indifferent curves boundary point intimum bounded integers cardinality iniercepl term Cartesian product interior numbers Cobb-Douglas function interior point closed interval intersection codomain intervals compact irrational numbers complement isoquanls completeness property level set composite mapping linear function concavity logarithmic function convex combination mapping convexity natural logarithm coordinate system natural numbers dependent variable neighborhood dimensions nonnegative numbers disjoint one-to-one correspondence distance ordered pair domain partition exponent point sets exponential function power function elements power se t empty set proper subset Euclidean distance pure number function quasiconcavily image quasicorrvexity image set rational numbers implicit function range

rectangular hyperbola slope coefficient real line subset real numbers supremum real-valued functions union relative difference universal set set Venn diagram singleton worse set slope

Review Questions t. How does a Venn diagram help to illustrate the possible relationships between sets and subsets?

2. What is meant by "the real line"?

3. What is a supremum? What is an infimum?

4. What is a point set? What is a convex set?

5. Distinguish between closedness and boundedness of a point set. fi. Distinguish between concavity and convexity of a function.

7. Distinguish between quasiconcavity and concavity.

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