The phrase "and existence of a" is correct and usable in written English.
It can be used in contexts discussing the presence or reality of something, often in philosophical, scientific, or legal discussions.
Example: "The study aims to explore the nature and existence of a universal moral code."
Alternatives: "and presence of a" or "and reality of a".
Deregulation of autophagy is known to affect many processes that can control the formation and existence of a cancer cell, but paradoxes still exist in what we currently understand about the relationship between autophagy and cancer (4, 6).
For Turkey, the growing influence of the Kurds and existence of a Kurdish entity on its southern border is unacceptable.
And, existence of a warmer climate in the past also doesn't mean that we'll like a warmer climate in the future.
UNION SURVEY IS QUESTIONED The chairman of the N.F.L.'s health and safety advisory committee questioned the validity and existence of a survey of players that the union said showed that 78 percent of players polled do not trust team medical staffs.
Cui and Takeuchi obtained some new conditions for the permanence and existence of a positive periodic solution of system (1).
The characterizations of achievable rate region and existence of a unique Nash equilibrium have been provided in [6].
Explain that they will be researching the history and existence of an animal from the International Society of Cryptozoology list of "Unresolved Claims" (//www.internationalsocietyofcryptozoology.org/Cryptids/Default.aspx).aspx
For Ockham, intuitive cognition was the direct intellectual cognition of the presence and existence of an object.
We prove existence of solutions to the state system and existence of an optimal control, as well as derive corresponding sensitivity and adjoint equations.
The similarity between the predicted and experimental results verified the validity of the model and existence of an optimal point.
Zhang [9] studied the permanence and existence of an almost periodic solution of system (1.3) with almost periodic coefficients.
