One
way to argue for that would to be in terms of essences or natural
kinds (which capture the essence) in regards to properties or
things/objects/entities. Thus, even if peripheral aspects of
entity/property X change (or peripheral stuff changes X), if
“all things remaining equal”, then the essence of X will remain
the same.
There
are indeed what some people call “causal islands”: abstract
objects such as numbers, propositions, etc. (If you accept such
things.) In addition, if an object or a property has an essence, then
that object will retain its essence “all other things remaining
equal”. In other words, in this language, essences are indeed
causal islands. They must also be independent. Indeed you can
say that essences are also abstractions (if not exactly abstract
objects).
Again,
in the causal flux, object/property X will keep its essence.
Does
the belief in the aforementioned “self-subsistent” (as it were)
entities (or properties) involve an automatic philosophical
commitment to (or assumption of) the phrase “all other things being
equal”? That is, that property or entity X would have exactly this
nature regardless of all else?
It can
be said that if you change one thing, then you change everything else
too. (As various kinds of monist have argued.) Or, less dramatically,
if you change one thing, then you must automatically change other things.
For
example, if President Obama had an extra finger, then there would
also be many other differences too. Even if President Obama had an
extra molecule, many other things would be different. For one, that
extra molecule would automatically affect other molecules. And that
means that one tiny change (a different molecule) would bring about
many other changes.
This
means that X is dependent on other things. X will also affect other
things.
Finally,
surely saying that “X is an independent property” can't mean that
X could exist without anything else. Although it can be said that X
could exist without some of the things it now coexists with.
(Does
all the above work against the various monistic theories - and
theories of interdependence - in which no entity or property can ever
have a nature apart from – all? - other things?)
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