The phrase "a lengthy theory" is correct and usable in written English.
It can be used when describing a theory that is extensive or detailed in nature.
Example: "The researcher presented a lengthy theory on the origins of the universe, which sparked much debate among the scientists."
Alternatives: "an extensive theory" or "a detailed theory".
But as I discussed in a lengthy article four years ago, this theory has been fully discredited over the years as a cost-containment tool in U.S. health care.
He launches into a lengthy diatribe on the theory of evolution, ending with, "How much more proof do you need?" His wife is a Christian.
It did again Tuesday evening, with a lengthy rundown of the theories, links to sources that debunked them, and an official statement from Clinton's doctor, Lisa Bardack — whose name appeared on forged "medical records" that had been spread online.
In his introduction to Atlanta, written in 1842 but not published until 1853, Chivers gives a lengthy discussion of his poetic theory, pre-dating many ideas Poe would suggest in "The Poetic Principle" (1850).
Earlier this month, Syrian state television attempted to undermine the credibility of a British photographer, Paul Conroy, by echoing a conspiracy theory developed in a lengthy post on Infowars, which claimed that the journalist was secretly working for MI6, the British intelligence agency made famous by the James Bond films.
He met Claude Shannon, now known as "the father of information theory", and had a lengthy conversation about the idea of building an electronic brain – a discussion that excited Turing so much he immediately bought himself a book on electronic components for the long journey back across the Atlantic.
The depth and breadth of scientific research influencing evolutionary theory has produced a lengthy and complex description of the mechanisms and processes of evolution.
Bratton co-wrote a lengthy defense of the broken windows theory this week and, at the press conference, he made clear that if a slowdown was in fact taking place it would be dealt with "accordingly". So you can bet, whatever the cause of the reduction in arrests and summonses, their numbers will begin to increase soon, if they haven't already.
Bohm had been the favoured protegé of Niels Bohr, and his first book, Quantum Theory (Englewood Cliffs, NJ: Prentice-Hall, 1951), was a lengthy defence of the Copenhagen Interpretation of the quantum theory.
There were mathematics errors large and small, a lengthy detour into one candidate's conspiracy theory, and a me-first contest over who was the earliest to propose a moratorium on school closings.
