"of existing things" is grammatically correct and can be used in written English.
It is often used to describe the characteristics or qualities of things that currently exist. Example: The study focused on the conservation of existing things, rather than creating new ones.
According to Meinong's examples of existing things, real objects of higher order may also exist (an experience or a house, for example), but the number of stones and the (dis- similarities between the stones of an existing house dis- similaritiesy only subetweennd are of ideal characthe (1899, §6; 1978, 252).
He argued that the fact of existence cannot be inferred from or accounted for by the essence of existing things and that form and matter by themselves cannot interact and originate the movement of the universe or the progressive actualization of existing things.
Where D is, as usual, taken to be the class of existing things, free logic may be characterized as logic the referents of whose singular terms need not exist.
Museums edit, for our convenience, the universe of existing things.
Openness also means the ability for people to build their own tools ontop of existing things.
Time, for Mīr Dāmād, was neither a mere being of reason nor an accident of existing things.
Following Grosseteste, Kilwardby took human knowledge to comprise the comprehension of the truth of contingently existing things, of what frequently is in the same way, and of what has an absolute way of being and is immutable such as the principles and conclusions of a demonstration.
Intuitively, the extension includes those things in the actual world to which the expression applies: e.g., the extension of the name 'Barack Obama' is the man Obama, the extension of the predicate 'is cool' is the set all the actual cool things, and the extension of a two-place predicate 'is cooler than' is the set of pairs of actually existing things the first of which is cooler than the second.
The metaphysical view amounts to the claim that the world consists of a plurality of independently existing things exhibiting qualities and standing in relations.
Whereas Descartes thinks of God as existing outside the world of the existing things He created (see Meditations III, 13 and 22) Spinoza holds that whatever exists is just a peculiar way in which God is present (see Ethics I, XXV, Corrolarium).
Because its existence is not contingent on or necessitated by something else but is necessary and eternal in itself, it satisfies the condition of being the necessitating cause of the entire chain that constitutes the eternal world of contingent existing things.
