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8 Cards in this Set

  • Front
  • Back
Sufficient Condition
An event or circumstance whose
occurrence indicates that a necessary condition must also occur.
Necessary Condition
An event or circumstance whose
occurrence is required in order for a sufficient condition to occur.
Mistaken Reversal
Switches the elements in the sufficient and necessary
conditions, creating a statement that does not have to be true.
Mistaken Negation
Negates both conditions, creating a statement that does not have to be true.
Sufficient Condition Indicators
If
When
Whenever
Every
All
Any
People who
In order to
Necessary Condition Indicators
Then
Only
Only if
Must
Required
Unless
Except
Until
Without
Unless Equation
- 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.
The Double Arrow
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.