A Fortiori/Examples
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Examples of Use of A Fortiori
Prime Number
The following is an example of a fortiori reasoning:
- The number $11$ is a prime number.
- Hence $11$ a fortiori is not divisible by $5$.
A Family Matter
The following is an example of a fortiori reasoning:
- I am too old for this game; therefore, my father is also too old.
That is, the knowledge:
- My father is too old for this game.
arises a fortiori from the stronger knowledge that:
- I am too old for this game.