undistrubuted

A specific type of error in deductive reasoning in which the minor premise and the major premise of a syllogism might or might not overlap. Consider these two examples: (1) "All reptiles are cold-blooded. All snakes are reptiles. All snakes are cold-blooded." In the first example, the middle term "snakes" fits in the categories of both "reptile" and "things-that-are-cold-blooded." It is what logicians call a "distributed middle term." (2) "All snails are cold-blooded. All snakes are cold-blooded. All snails are snakes." In the second example, the middle term of "snakes" does not fit into the categories of both "things-that-are-cold-blooded" and "snails." It is an undistributed middle term. Sometimes,equivocation (see below) leads to an undistributed middle term.