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The phrase "a formula" is correct and usable in written English.
It can be used when referring to a mathematical or scientific expression, or a set of rules or principles for solving a problem.
Example: "To calculate the area of a circle, you can use the formula A = πr²."
Alternatives: "an equation" or "a method".
Exact(59)
"It's not a formula".
It's a formula for ambiguity.
That's a formula for failure.
There is a formula here.
"There was a formula".
Rachel has a formula.
Or even a formula.
In American cinema, there's a formula.
"A recipe is a formula," he said.
"Bones," "Elementary," "Perception" — it's a formula.
Similar(1)
It was a formula-embracer.
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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