28 lines
807 B
Markdown
28 lines
807 B
Markdown
Page 411$a
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**Test Yourself**
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1. The notation $A \subseteq B$ is read "_____" and means that _____.
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2. To use an element argument for proving that a set $X$ is a subset of a set
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$Y$, you suppose that _____ and show that _____.
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3. To disprove that a set $X$ is a subset of a set $Y$, you show that there is
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_____.
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4. An element $x$ is in $A \cup B$ if, and only if, _____.
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5. An element $x$ is in $A \cap B$ if, and only if, _____.
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6. An element $x$ is in $B - A$ if, and only if, _____.
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7. An element $x$ is in $A^c$ if, and only if, _____.
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8. The empty set is a set with _____.
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9. The power set of a set $A$ is _____.
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10. Sets $A$ and $B$ are disjoint if, and only if, _____.
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11. A collection of nonempty sets $A_1, A_2, A_3, \dots$ is a partition of a set
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$A$ if, and only if, _____.
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