Complete Guide to Biconditionals: Definitions and Usage
- \( p \rightarrow q \): If p, then q.
- \( q \rightarrow p \): If q, then p. For the biconditional to be true, both these conditions should hold.
Examples
Practice Questions:
- For the definition “A line is perpendicular to another if and only if they form a \(90^\circ\) angle,” write the forward and backward readings.
- Explain why the statement “A figure is a rectangle if it has four right angles” is not a biconditional.
- Forward reading: If a line is perpendicular to another, they form a \(90^\circ\) angle. Backward reading: If two lines form a \(90^\circ\) angle, one line is perpendicular to the other.
- The statement is only one way. It states a condition for a figure to be a rectangle but doesn’t clarify if having four right angles is the only criterion or if there are others, nor does it state the reverse (that if a figure has characteristics other than four right angles, it can’t be a rectangle). Thus, it’s not a biconditional.
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