The phrase "a common assertion that" is correct and usable in written English.
It can be used when introducing a widely held belief or statement that is often repeated or accepted as true.
Example: "There is a common assertion that exercise improves mental health, which is supported by various studies."
Alternatives: "a widely held belief that" or "a frequent claim that".
Our study also documented the common assertion that a short-term focus carries costs.
Prosecutors, in their argument for a single hearing, said they expected both men to make a much more central and common assertion: that each was less culpable and deserving of the death penalty than the higher-ups who ordered the bombings, starting with Mr. bin Laden.
So, does this place a large question mark over the common assertion that climate change is causing the world's glaciers to melt?
But the common assertion that energy drinks stop a person from feeling intoxicated is just not true, according to a recent study at Boston University.
Moreover, an analysis of the genetic composition of these alate and apterous populations in four geographic regions suggested differences in their life-history strategies and questioned the common assertion that A. gossypii is an anholocyclic species in most of its distribution area, including Europe [ 36].
Moreover, an analysis of the genetic composition of these alate and apterous populations in four geographic regions suggested differences in life-history strategies, such as host choice and reproductive mode, and questioned the common assertion that A. gossypii is an anholocyclic species throughout its distribution area, including Europe.
In Growing Up in the Black Belt (1941), Johnson denied the common assertion that U.S. race relations constitute a true caste system; he pointed out that the status of blacks in American society did not have universal acquiescence or a religious basis.
This observation contrast the common assertion that dry tropical forests have a low regeneration potential [e.g. 21], [38], [40].
ACCURACY -- Mr. Kerry's common assertion that the economy has lost three million jobs under President Bush is almost true, technically.
This compilation confirms the common assertion that many arroyos formed in the 1880s, but many arroyos also formed in the 1890s and early 1900s.
