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8 Cards in this Set
- Front
- Back
Sufficient Condition
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An event or circumstance whose
occurrence indicates that a necessary condition must also occur. |
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Necessary Condition
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An event or circumstance whose
occurrence is required in order for a sufficient condition to occur. |
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Mistaken Reversal
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Switches the elements in the sufficient and necessary
conditions, creating a statement that does not have to be true. |
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Mistaken Negation
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Negates both conditions, creating a statement that does not have to be true.
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Sufficient Condition Indicators
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If
When Whenever Every All Any People who In order to |
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Necessary Condition Indicators
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Then
Only Only if Must Required Unless Except Until Without |
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Unless Equation
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- Use whenever "unless," "except," "until," and "without" occur.
- Involves two steps: 1. Whatever term is modified by "unless," "except," "until," or "without" becomes the necessary condition. 2. The remaining term is negated and becomes the sufficient condition. |
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The Double Arrow
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The Double Arrow is generally introduced in 1 of 3 ways:
1. Use of the phrase "if and only if." 2. Use of the phrase "vice versa." 3. By repeating and reversing the terms. |