In the Variables section of Discrete Mathematics, one learns how to use variables when communicating mathematics. In addition, universal statements, existential statements, and conditional statements are studied. The notes for this section can be found here.
Here are some additional exercises to try:
1) Use variables to rewrite the following sentence more formally
Any real number raised to the fourth power is nonnegative.
2) Use variable to rewrite the following sentence more formally
Do there exist numbers with the property that the difference of their cubes equals the cube of their difference?
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