In the scientific method, an experiment is an empirical method that arbitrates between competing models or hypotheses. Experimentation is also used to test existing theories or new hypotheses in order ...
The scientific method requires observations of nature to formulate and test hypotheses. It consists of these steps:Asking a question about a natural phenomenonMaking observations of the phenomenonHypo ...
The principle has a variety of expressions, all of which are perhaps best summarized by the following:For every entity X, if X exists, then there is a sufficient explanation for why X exists.For every ...
There are two principles here that must be distinguished (equivalent versions of each are given in the language of the predicate calculus). Note that these are all second-order expressions. Neither of ...
A discrete probability distribution shall be understood as a probability distribution characterized by a probability mass function. Thus, the distribution of a random variable X is discrete, and X is ...
A continuous probability distribution is a probability distribution that has a probability density function. Mathematicians also call such a distribution absolutely continuous, since its cumulative di ...
Thinking in abstractions is considered by anthropologists, archaeologists, and sociologists to be one of the key traits in modern human behaviour, which is believed to have developed between 50,000 an ...
The word "metaphysics" derives from the Greek words μετ? (metá, "beyond", "upon" or "after") and φυσικ? (physiká, "physics"). It was first used as the title for several of Aristotle's work ...
Epistemology is a neologism derived from the Greek epistēmē meaning "knowledge" and logos meaning "study of". It translates the German concept Wissenschaftslehre, which was used by Fichte and Bolzan ...
According to Presentism, time is an ordering of various realities. At a certain time some things exist and others do not. This is the only reality we can deal with and we cannot for example say that H ...
The earliest recorded Western philosophy of time was expounded by the ancient Egyptian thinker Ptahhotep (c. 2650–2600 BC), who said, "Do not lessen the time of following desire, for the wasting of t ...
Albert Einstein proposed three tests of general relativity, subsequently called the classical tests of general relativity, in 1916:the perihelion precession of Mercury's orbitthe deflection of light b ...
In classical mechanics as in physics, the field is not real, but merely a model describing the effects of gravity. The field can be determined using Newton's law of universal gravitation. Determined i ...
Whenever the ratio of an object's mass to its radius becomes sufficiently large, general relativity predicts the formation of a black hole, a region of space from which nothing, not even light, can es ...
Main articles: History of general relativity and Classical theories of gravitationAlbert Einstein developed the theories of special and general relativity. Picture from 1921.Soon after publishing the ...
