The phrase "constitute the fundamental" is correct and can be used in written English.
You can use this phrase when you are trying to emphasize that something is fundamental or basic. For example: "The principles of democracy constitute the fundamental basis for governing."
Together they constitute the fundamental theories of 20th-century physics.
Fusion reactions constitute the fundamental energy source of stars, including the Sun.
"Many of the phenomena discovered by Professor Ippen constitute the fundamental bases of today's technologies.
He shared the award with Schwarz for their work developing string theory, which holds that vibrating "strings" constitute the fundamental particle of the universe.
Abstract: Theoretical models of stars constitute the fundamental bedrock upon which much of astrophysics is built, but large swaths of model parameter space remain uncalibrated by observations.
Accordingly, genetic engineering techniques such as molecular cloning and recombinant DNA technology, molecular manipulations, and cellular manipulations constitute the fundamental aspects of this article.
A nine-week programme, CORe consists of only three courses, meant to constitute the "fundamentals of business".
Which, in turn, calls into question the larger issues of accountability, freedom of information and judicial impartiality that constitute the fundamentals of democracy.
The efficiency is understood in the sense of mutual information (between input and output signals), which constitutes the fundamental concept of the Shannon communication theory.
Max von Laue of Germany had shown in 1912 that crystals can be used as three-dimensional diffraction gratings for X-rays; his technique constituted the fundamental evidence for the wavelike nature of X-rays.
