# [[Mereology|Mereological]] [[Fallacies|Fallacy]] > The fallacy of division is an informal fallacy that occurs when one reasons that something that is true for a whole must also be true of all or some of its parts. > > An example: > > > > The second grade in Jefferson Elementary eats a lot of ice cream > > Carlos is a second-grader in Jefferson Elementary > > Therefore, Carlos eats a lot of ice cream > > The converse of this fallacy is called fallacy of composition, which arises when one fallaciously attributes a property of some part of a thing to the thing as a whole. > > If a system as a whole has some property that none of its constituents has (or perhaps, it has it but not as a result of some constituents having that property), this is sometimes called an emergent property of the system. > > The term **mereological fallacy** refers to approximately the same incorrect inference that properties of a whole are also properties of its parts. > > [Wikipedia](https://en.wikipedia.org/wiki/Fallacy%20of%20division)