unobservable
101Principle of bivalence — In logic, the semantic principle of bivalence states that every proposition takes exactly one of two truth values (e.g. truth or falsehood ). The laws of bivalence, excluded middle, and non contradiction are related, but they refer to the… …
102Psychometrics — is the field of study concerned with the theory and technique of educational and psychological measurement, which includes the measurement of knowledge, abilities, attitudes, and traits. The field is primarily concerned with the study of… …
103Perception — For other uses, see Perception (disambiguation). Perceptual redirects here. For the Brian Blade album, see Perceptual (album). Robert Fludd s depiction of perception (1619) …
104René Descartes — Descartes redirects here. For other uses, see Descartes (disambiguation). René Descartes Portrait after Frans Ha …
105Stellar evolution — Life cycle of a Sun like star Stellar evolution is the process by which a star undergoes a sequence of radical changes during its lifetime. Depending on the mass of the star, this lifetime ranges from only a few million years (for the most… …
106Strong interaction — This article is about the phenomenon in particle physics. For the concept in ecology, see Food chain. For the interaction that binds together the particles in atomic nuclei, see Nuclear force. Standard model of particle physics …
107Truth — For other uses, see Truth (disambiguation). Time Saving Truth from Falsehood and Envy, François Lemoyne, 1737 Truth has a variety of meanings, such as the state of being in accord with fact or reality …
108Time — This article is about the measurement. For the magazine, see Time (magazine). For other uses, see Time (disambiguation). The flow of sand in an hourglass can be used to keep track of elapsed time. It also concretely represents the present as… …
109Thomas Aquinas — Aquinas redirects here. For other uses, see Aquinas (disambiguation). Thomas Aquinas Thomas Aquinas depicted in stained glass Born Thomas Aquinas 1225 Roccasecca, Kingdom of Sicily …
110Uncertainty principle — In quantum physics, the Heisenberg uncertainty principle states that locating a particle in a small region of space makes the momentum of the particle uncertain; and conversely, that measuring the momentum of a particle precisely makes the… …
