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Discover LudwigThe phrase "first principles" is correct and commonly used in written English.
It refers to the fundamental or most basic ideas or concepts that serve as the foundation for a particular subject or belief. Example: In order to understand the complex scientific theory, it is important to first grasp the first principles that it is built upon.
Dictionary
first principles
noun
Plural of first principle
Exact(58)
Their rows were rarely over first principles.
The authors start from first principles.
Not moral principles, but epistemic first principles.
Here are the first principles.
It gets to first principles.
Let's start with first principles.
Let's get first principles right.
"He considers things from first principles".
"But surely there are first principles?
"Let's go back to first principles.
He works, then, from first principles.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com