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The phrase "a very efficient formula" is correct and usable in written English.
You can use it when describing a formula that produces results quickly and effectively, often in a scientific or mathematical context.
Example: "After testing various methods, we found that a very efficient formula for calculating the area of a circle is A = πr²."
Alternatives: "an extremely effective formula" or "a highly efficient formula."
Exact(1)
Proposition 2.3 is a very efficient formula for the computation of the sum ∑ k = 1 N − 1 σ i ∗ ( p m k ; p m ) σ j ∗ ( p n ( N − k ) ; p n ).
Similar(59)
This discrete orthogonality property leads us to a very efficient interpolation formula.
"He'd run a very efficient government.
It had been a very efficient hour.
"They have been a very efficient operator".
"He's just a very efficient and very organized judge.
"He's a very efficient player," Richmond Coach Jerry Wainwright said.
"They're a very efficient and effective lobbying effort.
That aside, it's a very efficient tent.
"Marie-Louise has become a very efficient runner".
"Rail is a very efficient way to move goods.
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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