The phrase 'basis for existence' is correct and usable in written English.
You could use it to describe the circumstances or conditions that are necessary for something to sustain itself or continue existing. For example: "A strong and vibrant economy is the basis for existence of any modern nation."
Outside the Byzantine Empire, however, the urban basis for the existence of policing organizations had almost disappeared.
The baptism of the Lithuanians removed the basis for the existence of the Teutonic Order, which had officially been founded to defend Christianity.
He denounced as a pact with heresy the Peace of Augsburg, the first permanent legal basis for the existence of Lutheranism and Catholicism in Germany.
"With profound sadness at ruining a favorite legend," they wrote in the April 1995 issue of The Biological Bulletin, published by the Marine Biological Laboratory in Woods Hole, Mass., a distinguished research institution, "we find no basis for the existence of Octopus giganteus".
Perhaps McCain has failed to understand that the Miranda Rights – which stipulate that a suspect must be informed that they have the right to remain silent and the right to an attorney -- are of course by design intended to be read to suspects 'before we find out what it's all about.' This is the basis for their existence.
and Schauder estimates, which play important roles in the theory of partial differential equations, are two fundamental estimates for elliptic and parabolic equations and the basis for the existence, uniqueness, and regularity of solutions.
This is true despite the fact that agriculture comprises only 0.9% to Germany's gross domestic product (GDP) [2], since it is the crops cultivated by farms that provide basis for our existence.
In all these instances the use of the notion of cause is central to the legal inquiry, since to establish responsibility it must be shown that the harm was done or brought about by the agency that the law treats as a potential basis for the existence or extent of liability.
