The first of these rejects the existence dimension by rejecting the claim that the distinctive objects of that subject-matter exist, while the second admits that those objects exist but denies that they instantiate any of the properties distinctive of that subject-matter.
Inasmuch as It exists, the First Principle partially coincides with the subject-matter of metaphysics, so that theology is included in ontology: the existence of God is part of existence (Ilāhiyyāt, I, 2, 14, 4 10: the Principle is the Principle of part of being).
The dual definition of metaphysics reflects a twofold way of considering existence or being itself: when it is taken as set apart from any condition, and hence taken to be absolute, being is the subject-matter of metaphysical investigation.
First, a philosopher who denied the existence of those things that had once been seen as constituting the subject-matter of metaphysics first causes or unchanging things would now be considered to be making thereby a metaphysical assertion.
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The forms of non-realism can vary dramatically from subject-matter to subject-matter, but error-theories, non-cognitivism, instrumentalism, nominalism, certain styles of reductionism, and eliminativism typically reject realism by rejecting the existence dimension, while idealism, subjectivism, and anti-realism typically concede the existence dimension but reject the independence dimension.
Sightings will never lack subject-matter.
Subject-matter experts were given double weight.
It's a matter of existence or non-existence".
But according to the strictures applying to an Aristotelian science no science can probe the existence of its subject matter, but rather must take it as given from a higher science (in this case, metaphysics).
