The phrase "a basic principle is that" is correct and usable in written English.
You can use it to introduce a fundamental idea or rule that underpins a discussion or argument.
Example: "A basic principle is that all living organisms require water to survive."
Alternatives: "a fundamental rule is that" or "a key tenet is that".
A basic principle was that inclusion criteria must have a meaningful influence in goal setting for treatment.
It's a humanitarian program whose basic principle is that the United States should suspend deportations to countries that have been destabilized by war or catastrophe.
To screen for Bcl-2 protein inhibitors, we used fluorescence polarisation (FP), whose basic principle is that a fluorescent peptide tracer (Flu-Bid-BH3) and a nonfluorescent small molecule inhibitor compete for binding to the Bid BH3 domain of Bcl-2 proteins.
His basic principle is that, for a healthy and efficient state, an organic relationship must be established between population and government and that citizens must be brought into responsible participation in the state's affairs.
Legal language is full of different ways to parse the idea of intentionality, but one basic principle is that a person is held to "intend" the foreseeable consequences of their actions.
Because all measurements have noise, this postulate will not be true in all real data sets, but the basic principle is that a better ligand in 1 data set should also be a better ligand in another data set.
His basic principle is that if a child isn't learning it is always because the teacher is doing something to confuse him.
The basic principle is that, beyond a small loss currently set at €5m over three years, clubs' outgoings must match their incomings.
Other useful tools in model theory include the pigeonhole principles, of which the basic principle is that, if a set of large cardinality is partitioned into a small number of classes, some one class will have large cardinality.
The first basic principle is that all member countries form "a single postal territory for the reciprocal exchange of correspondence".
