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A fortiori argument means an argument from a strong source. This term is derived from the Latin legal maxim argumentum a fortiori. A fortiori argument is applied by following the logic that a point to be proved is followed from a stronger claim. This principle is applied in situations where:
1. a proposition previously given or proven in the argument contains and implies a variety of "weaker" or less contentful materials ; and
2. a proposition being proven is only one of the propositions contained and implied.
There are mainly two types of a fortiori argument. They are:
1. a maiore ad minus, that means from greater to smaller; and
2. a minore ad maius, that means from smaller to greater.