Wikipedia:
a minore ad maius
The a minore ad maius argument denotes an inference from smaller to bigger: In a strictly formulated rule (typically a legal regulation or ban), a more general rule is contained.
The reverse and more universally known argument is a maiore ad minus, which also usually has a broader usage. The meaning of the a maiore ad minus argument is incomparably more general. It pertains to applications of the a fortiori argument.
Example
Example for the a minore ad maius argument:
- If it is forbidden to ride a bike with one extra passenger, then it is also forbidden to ride a bike with two extra passengers.
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