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.
I have stated previously that I am a registered Independent, but have voted by candidate which means Democratic and or Republican... My point is not to dwell on how a portion of that electors continues to believe in unproven and debunked theories, but rather how the party has abandoned it’s family values ... I ask why? ... Subscribe Today ... JerryDaniels ... .
But on his new show The Water Cooler on RealAmerica's Voice, he's hit a new low with election conspiracy theories and vaccine misinformation, while providing a ... During the show, Pompeo freely pushed the unproven coronavirus lab leak theory without any pushback from Brody.
Six lawyers facing sanctions in Michigan over their attempt to reverse the state's 2020 presidential election say "suspicions" about the vote in "the highest levels" of government are among the reasons they should not be penalized ... They cited conspiracy theories about voting machines and unproven assertions of fraud in their arguments ... Capitol ... Email.
Splashing across six pages of the Daily Telegraph, her follow-up story on the "bombshell dossier" purportedly gave weight to the lab leak >theory ... "And you had a president who was fostering unproven theories for all sorts of things ... .
Her grim message came at a time of growing anxiety and confusion, especially among parents of young children who are still not eligible to take the shot ...Jamie Raskin, D-Md ... But it was dominated by efforts to promote an unproven theory that the Chinese released a virulent, human-made virus on the world and accusations that Democrats covered it up ... �.
The state Legislature’s proposed legislation would ban training in and promotion of what the JCA calls “critical social justice” and “cultural Marxism” and claims that the ideologies listed are radical, biased, and factually unproven ...Theory perspective,” the letter reads.
But, as we know, all good things come in… Fours?. That's right ... See more ... If you recall, a reference to an astronaut training program in WandaVision from ActingDirectorHayward sparked off theories that SWORD would have links to Fantastic Four. That has, for now, been unproven – but Fantastic Four is very much officially happening ... .
ElectionsPollsters... ... By STEVEN SHEPARD ... Voters weren’t lying to pollsters about whom they’d support because of some kind of “shy Trump” theory (otherwise the errors wouldn’t be larger in downballot races) ... The most plausible — yet still unproven — theory is that the voters the polls are reaching are fundamentally different from those they are not ... .
In February, it largely dismissed the possibility that the coronavirus had leaked from a laboratory in the Chinese city of Wuhan, a theory that has regained some traction despite remaining unproven ... The group said the theory remained "viable" and noted that only four pages of WHO's 313-page report had discussed it.
Dear Editor, ...It’s also sad to see these people demeaning their elected officials, yelling over speakers, being boorish and resorting to “thuggery” to try and intimidate others ... They present scientific reasoning and conclusions from informed sources as opposed to unproven (or even disproven) theories from internet sites. Wake up, people ... Mike Hart ... .
Some cases were reported among the US officials in China and even in Washington, DC, not far from the White House...Various unproven theories about its origin include possibilities of directed microwave radiation attacks by US adversaries, infectious diseases, exposure to fumigation pesticides and even noises made by a species of cricket ... .
In February it largely dismissed the possibility that COVID-19 may have leaked from a laboratory in the Chinese city of Wuhan, a theory which has since regained some traction despite remaining unproven ... But the idea has regained some currency in recent months, though China's government has continued to dismiss the theory.