The phrase "a principle which is" is correct and usable in written English.
It can be used when defining or explaining a specific principle in a discussion or academic context.
Example: "A principle which is fundamental to our understanding of ethics is the concept of fairness."
Alternatives: "a principle that is" or "a principle which serves as".
"We believe we have a principle, which is that we do not want poor people stigmatized.
The requirement for the successful tender is that they be without any taint of corruption; a principle which is then abruptly compromised by violent events.
But by his persistence Joyce established a principle, which is that the artist must have absolute freedom to work with the world he or she has stumbled across, the world as it is.
"We do have a principle which is enshrined in statute, that people who have been convicted, foreigners who have been convicted of serious criminal offences, have the automatic revocation of their visa".
Aristotle says that it is a principle which "is necessary for anyone to have who knows any of the things that are" (Metaph IV 3 1005b15).
Previous work has shown predictive policing based on statistical analysis to have considerable potential (Johnson et al.2009a), and the desire to build on this is well-aligned with the desire of administrators to carry out policing more efficiently; a principle which is also a central theme of the field of crime science (Laycock2005).
To hold that this search and seizure were lawful as to the respondent would permit a quibbling distinction to overturn a principle which was designed to protect a fundamental right.
The most basic of these include the question over whether there is a universal right to receive reasonable internet connection and speed in an online age, a principle which was the basis of the universal service obligation for telephones in the postwar period.
Theophrastus says that Alcmaeon did not explain sensation by the principle of like to like (i.e., by the likeness between the sense organ and what is perceived), a principle which was used by many early Greek thinkers (e.g., Empedocles).
The environmental performance is quantified following life cycle assessment (LCA) principles, which are represented in the model formulation through standard algebraic equations.
Each topic in the book has been chosen to elucidate a general principle, which is explored in a precise formal setting.
