The phrase "an opposing theory" is correct and usable in written English.
It can be used when discussing a theory that contradicts or challenges another theory in a particular field of study or debate.
Example: "In the ongoing debate about climate change, some scientists advocate for an opposing theory that suggests natural cycles are the primary cause of temperature fluctuations."
Alternatives: "a conflicting theory" or "an alternative theory".
But this research contradicts an opposing theory, which proposes that the disease is out of our hands, because it comes down to random mutations in DNA replication.
Boy Crisis: L'Homme There are five of them, they're from Brooklyn, they take their name from a Newsweek's theory about falling standards in young men and their songs set out an opposing theory all of their own.
Gil and his ministry team have an opposing theory: tough intellectual property law is a 20th-century idea and most of the blossoming of world civilisation has happened perfectly well without it.
For every possible pattern, you can concoct an equally convincing opposing theory; for every victim, there are countless survivors.
At the conference, the magnetite and cryptochrome researchers made up distinct camps, each one quick to point out the opposing theory's deficiencies.
That misdemeanour lands her in the office of a psychiatrist who introduces her, in kindly fashion, to the concept of reincarnation and to the roughly opposing theory of amor fati, particularly as espoused by Nietzsche: the acceptance, or even embrace, of one's fate, and the rejection of the idea that anything could, or should, have unfolded differently.
Here's the opposing theory to this and frankly, one that economists are more inherently more comfortable with.
[ 5, 6] The opposing theory suggests that each additional role brings benefits, including increased social contacts and self-esteem, which contribute to better health and greater psychological well-being.
Although adenoma carcinoma sequence was firmly established, the disease natural history of colorectal neoplasm has been challenged by the opposing theory of de novo carcinogenesis (Kudo et al, 2000).
Pinker weaves this paradox from a series of opposing theories.
In the preface of the book, Hues rehearsed arguments that proved the earth is a sphere, and refuted opposing theories.
