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A theory provides an explanatory framework for some observation, and from the assumptions of the explanation follows a number of possible hypotheses that can be tested in order to provide support for, or challenge, the theory.
Scientific theories are distinguished from philosophical theories in that each of their theorems are statements about observable data, whereas a philosophical theory includes theorems which are ideas or principles.
A theory is a rational type of abstract thinking about a phenomenon, or the results of such thinking. The process of contemplative and rational thinking is often associated with such processes as observational study or research. Theories may be scientific, belong to a non-scientific discipline, or no discipline at all.
A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment. Such fact-supported theories are not "guesses" but reliable accounts of the real world. The theory of biological evolution is more than "just a theory".
This is a list of quantum field theories. The first few sections are organized according to their matter content, that is, the types of fields appearing in the theory. The first few sections are organized according to their matter content, that is, the types of fields appearing in the theory.
Almgren–Pitts min-max theory; Approximation theory; Arakelov theory; Asymptotic theory; Automata theory; Bass–Serre theory; Bifurcation theory; Braid theory; Brill–Noether theory; Catastrophe theory; Category theory; Chaos theory; Character theory; Choquet theory; Class field theory; Cobordism theory; Coding theory; Cohomology theory ...
Interdisciplinary historical research (3 C, 10 P) International relations theory (15 C, ... Circumscription theory; Clash of Civilizations; Conflict theories ...
Self-validation theory; Shadow (psychology) Shattered assumptions theory; Simulation theory of empathy; Social cognitive theory of morality; Social dominance theory; Social identity theory; Social investment theory; Sociocultural perspective; Socioemotional adaptation theory; Somatotype and constitutional psychology; Spatial intelligence ...