The phrase "a single existence" is correct and usable in written English.
It can be used when discussing the concept of living as one individual life or the idea of uniqueness in existence.
Example: "In a world filled with countless possibilities, each person experiences a single existence that shapes their identity."
Alternatives: "one life" or "a solitary life".
Not a single existence unastonishing.
And above all, not a single existence, not anyone's existence in this world.
The website is now a wormhole, a place in which it is possible to lose yourself in the beautiful but useless ephemera of a single existence.
A sentimental subject is not handled predictably, as a clever redneck poem; instead, it becomes the expression of an inner life, a single existence and sensibility — you think I'm a hick, but I've been to Europe — which is both amusing and unsettling.
Since no individual creature is the author of its own existence, but does in fact exist, each finite being must receive existence from a single being that exists necessarily.
The apparent topic was a new supranational monetary regime, in which a single currency is spent into existence by a single world economic institution.
It depicts a young women living a solitary, free, single existence in the big city.
At one place Ibn Kammuna argues from the interconnectedness of all reality, which implies that a single "necessary existence" must stand at the top of the causal chain.
In the ZF context, adding classes is a natural thing to do, for it enables one to reduce the infinite replacement scheme to a single set-existence axiom: "the image of a set in a class is a set" if augmented with suitable class-existence axioms.
There's not a single hat in existence that hasn't sent me into a violent rage.
In the digital age, execution is staggeringly important, and there isn't a single company in existence that can pull off polish and simplicity like Apple.
