Theory is a contemplative and rational type of abstract or generalizing thinking, or the results of such thinking. Depending on the context, the results might for example include generalized explanations of how nature works. The word has its roots in ancient Greek, but in modern use it has taken on several different related meanings. A theory is not the same as a hypothesis. 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.
A theory can be normative (or prescriptive), meaning a postulation about what ought to be. It provides "goals, norms, and standards". A theory can be a body of knowledge, which may or may not be associated with particular explanatory models. To theorize is to develop this body of knowledge.
As already in Aristotle's definitions, theory is very often contrasted to "practice" (from Greek praxis, πρᾶξις) a Greek term for "doing", which is opposed to theory because pure theory involves no doing apart from itself. A classical example of the distinction between "theoretical" and "practical" uses the discipline of medicine: medical theory involves trying to understand the causes and nature of health and sickness, while the practical side of medicine is trying to make people healthy. These two things are related but can be independent, because it is possible to research health and sickness without curing specific patients, and it is possible to cure a patient without knowing how the cure worked.
The game of chess is commonly divided into three phases: the opening, middlegame, and endgame. There is a large body of theory regarding how the game should be played in each of these phases, especially the opening and endgame. Those who write about chess theory, who are often but not necessarily also eminent players, are referred to as "theorists" or "theoreticians".
"Opening theory" commonly refers to consensus, broadly represented by current literature on the openings. "Endgame theory" consists of statements regarding specific positions, or positions of a similar type, though there are few universally applicable principles. "Middlegame theory" often refers to maxims or principles applicable to the middlegame. The modern trend, however, is to assign paramount importance to analysis of the specific position at hand rather than to general principles.
The development of theory in all of these areas has been assisted by the vast literature on the game. In 1913, preeminent chess historian H. J. R. Murray wrote in his 900-page magnum opus A History of Chess
that, "The game possesses a literature which in contents probably exceeds that of all other games combined." He estimated that at that time the "total number of books on chess, chess magazines, and newspapers devoting space regularly to the game probably exceeds 5,000". In 1949, B. H. Wood opined that the number had increased to about 20,000.David Hooper and Kenneth Whyld wrote in 1992 that, "Since then there has been a steady increase year by year of the number of new chess publications. No one knows how many have been printed..." The world's largest chess library, the John G. White Collection at the Cleveland Public Library, contains over 32,000 chess books and serials, including over 6,000 bound volumes of chess periodicals. Chess players today also avail themselves of computer-based sources of information.
When defining theories for foundational purposes, additional care must be taken and normal set-theoretic language may not be appropriate.
The construction of a theory begins by specifying a definite non-empty conceptual class , the elements of which are called statements. These initial statements are often called the primitive elements or elementary statements of the theory, to distinguish them from other statements which may be derived from them.
A theory is a conceptual class consisting of certain of these elementary statements. The elementary statements which belong to are called the elementary theorems of and said to be true. In this way, a theory is a way of designating a subset of which consists entirely of true statements.
Inside the conference's ballroom, many speakers criticized fellow Republicans and doubled down on unproven theories there was widespread fraud in former PresidentDonald Trump's loss in the 2020 presidential election ... "We haven't had fighters in the Republican Party," Lake told the crowd. "We've had a few but not many ... They're part of the uni-party.".
This one, his fifth since resigning as Greek’s finance minister eight years ago, advances an arresting if frustratingly unproven theory. the internet has killed capitalism ... You are witnessing the next great societal transformation ...Related articles ... .
MACKINAC ISLAND, Mich. — Republican presidential candidate Vivek Ramaswamy argued Friday in favor of the federal government intervening in states' election policies by requiring paper ballots and a single day of voting across the country ... Unproven theories about widespread election fraud are expected to be a focus of the three-day GOP gathering ... .
... candidate Kari Lake and Dinesh D’Souza, the conservative filmmaker behind the election conspiracy theory film "2000 Mules," are scheduled to speak at the conference. Like Karamo, both Lake and D'Souza have spread unproven theories of fraud in the 2020 presidential election.
6 protester at center of unproven, hard-right conspiracy theories. Epps became the focus of conspiracy theories — some amplified by Donald Trump and his allies — accusing him of being an FBI informant...Ted Cruz of Texas, publicly speculated about Epps’ ties to the FBI and fueled conspiracy theories about the riot.
... “unarguable that high-profile Fox voices fed the story that the election was stolen and that January 6 an important chance to have the results overturned.” Scott previously scolded Fox News hosts and anchors who called out election misinformation and unproven conspiracy theories.
Republish this article GENEVA ... This session is scheduled to run from 11 September to 13 October ... The latter, in theory, would cool the planet by reflecting light back into space. Part of the concern is the unproven and theoretical nature of this geo-engineering tech, for now referred to as “new technologies intended for climate protection”, or NTCPs ... .
Some social media users — on Reddit, on Twitter, on Instagram, on Facebook, and possibly beyond — are spinning a theory ... If she’s doing this — which is a compelling theory, but one that remains unproven — it’s likely not her own idea.
But the movie has garnered negative headlines after its lead actor, Jim Caviezel, publicly linked the film’s anti-exploitation plotline to unproven Q-Anon theories ... Caviezel has garnered his own controversies since the film’s release by expounding the baseless Q-Anon theory that ...
In this article, I summarise an investigation of the ‘big bang theory’, with reference to selected books and articles that refer to this contentious subject. The creation of the universe is explained today in mainstream modern science by the big bang theory, DNA research, and other models ... of ‘dark matter’ upon which the theory rests.
5 ... More. Trump indictment ... The telethon is being organized by The Gateway Pundit, a website that has promoted false and unproven theories about widespread fraud in the 2020 presidential election, and the MichiganConservative Coalition, a political group that previously supported the effort to create the false electors certificate ... Facebook. Twitter.
Close friends of the late pedophile financier Jeffrey Epstein are major donors to an outside group supporting Vivek Ramaswamy's presidential run and to his 2024 campaign ... The first step to fix corruption is to see it.' ... At times he has leant into unproven conspiracy theories around the events of 9/11 and the January 6 attack on the U.S. Capitol ... .