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The main article for this category is Theory.

Articles in this category should be moved to subcategories when appropriate. This category may require frequent maintenance to avoid becoming too large. It should list very few, if any, article pages directly and should mainly contain subcategories.

This category is for articles and categories primarily describing theories. A theory is nothing more than a group of true sentences which together support a particular conclusion which explains some object of study. There are theories in many and varied fields of study, including the arts and sciences.

Very often theories are named after the person who first formulated the theory (e.g. Luddism). Theories are also named using some description of the application of the theory to the subject matter plus the ending "ism" (e.g. Connectionism). There are also fields of study named "theory" whose basis is some initial set of assumptions describing the field's approach to a subject matter (e.g. set theory, model theory).