When you know something is a truck, you know quite a bit about it. Although the objects in a given category are different from one another, they have many commonalities. For example, consider the following categories: trucks, wireless devices, weddings, psychopaths, and trout. But, most of our categories seem much more informative-they share many properties. This set of things can be considered a category, a set of objects that can be treated as equivalent in some way. What do these things have in common? Only that they all happen to be on my desk as I write this. Ĭonsider the following set of objects: some dust, papers, a computer monitor, two pens, a cup, and an orange. Introduction Although you’ve (probably) never seen this particular truck before, you know a lot about it because of the knowledge you’ve accumulated in the past about the features in the category of trucks.
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