The phrase "original formulation" is correct and can be used in written English.
For example, "The original formulation of the theory was quite different from the modified version."
Its original formulation is provided in the first edition of On the Origin of Species in 1859.
In its original formulation, the domino theory was invoked fearfully.
"We've stayed as close as possible to our original formulation".
For more than a year, Purdue continued to sell the original formulation of OxyContin in Canada.
Mr. Bremer says now that he cannot recall using the term "advisory" in his original formulation.
This is a problem with psychology textbooks, not Freud's original formulation.
Einstein believed that it must be, and that his original formulation would violate that principle.
In response to widespread outrage from customers, it reverted to the original formulation within three months.
The original formulation of the supplement was also available through a seller on the UK eBay site on Thursday morning.
In Fermi's original formulation, the spins of an emitted beta and neutrino are opposing and so cancel to zero.
The original formulation of nested sampling is a strictly sequential algorithm.
