The phrase "a simple application of" is correct and usable in written English.
It can be used when describing a straightforward use or implementation of a concept, method, or principle.
Example: "This project is a simple application of the principles we learned in class."
Alternatives: "a straightforward use of" or "an easy implementation of".
A more sophisticated description of physical Brownian motion can be built on a simple application of Newton's second law: F = ma.
As a simple application of Bayes's theorem, consider the results of a screening test for infection with the human immunodeficiency virus (HIV; see AIDS).
A simple application of this expression is found in comparing intensities of radiation transmitted through layers of different thicknesses of two solutions of the same absorbing substance, one with a known concentration, the other unknown.
Many in the United Nations and the human-rights industry would like us to believe that a war crimes trial is a simple application of laws to facts, but nothing could be further from the truth.
"A simple application of the law is not going to produce what people will perceive to be justice, because many of the things that have been happening are not necessarily illegal, even if the public considered them immoral," said Tom R. Tyler, a professor of psychology at New York University who specializes in the study of popular conceptions of justice.
The motion of an electron in a uniform field is given by a simple application of Isaac Newton's second law of motion, force = mass × acceleration, in which the force is exerted on the electron by an applied electric field E (measured in volts per metre).
The appeals court was told to take another look at the case in light of the Supreme Court's ruling last week that a certain diagnostic test was not eligible for patents because it was a simple application of a law of nature.
Obviously, Theorem 4.1 is a simple application of Theorem 3.1.
A simple application of the Additivity Property shows that and.
A simple application of Minkowski's inequality proved Theorem 2.1.
Chemical engineering is not a simple application of classical disciplines.
