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Rwwww removed Category:Mathematicians from its parent category Category:Mathematical science occupations stating that people are not occupations. I'm reverting that deletion and putting the category back in its occupations parent tree. Please discuss below.
Two major reasons:
For the logic categorization that Rwww mentioned -- First, not every subcategory is a logical subpart of its parent category; they may indicate other types of relationships. See WP:CAT, but basically categories are not simply logical part/subpart trees. They also indicate other kinds of relationships.
Related to the general principles of categorization -- if you look through wikipedia, you will see that whenever a category exemplifies or includes multiple concepts, there are parent categories for each of the individual concepts. So "people by occupation" is in both "people" and in "occupation". Here, "mathematicians" is in "mathematical occupations" and "people by occupation". Please observe, Category:People by occupation is located within Category:Occupations, and in every subject-specific category, the relevant people practicing this occupation category is located within the occupation category. The mathematicians/mathematical occupations division is the more subject-specific instance of this example.
Most importantly, if one is browsing the occupation category, one should be able to easily get to people who practice that occupation. Similarly if one is browsing people by an occupation one should easily get to the occupation tree.
