The question of the existence of theoretical entities is the subject of W. T. Stace's article Science and the Physical World and Grover Maxwell's The Ontological Status of Theoretical Entities. Theoretical entities are things that are unobserved, either because they are sub-microscopic (electrons, neutrinos and the like), or because they simply do not exist in a traditional sense (gravity, warped space-time). We are unable to directly perceive these entities with our five senses, and therefore they would seem to consist of something other than what is tangible to our touch, taste, sight, hearing or smell. What then do these entities consist of? How can their existence be verified? What is their purpose? We shall see what both these philosophers of science think of these questions, and I will attempt to synthesize both positions into a coherent conclusion.
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