Title pretty much explains it all. What does it actually mean? Could someone explain to me what a "simple" is?
A link to wikipedia's
mereological nihilism article And this doesn't make it clear to me...
MTF
I'll give it try, as I understand it.
This philosophical position (as with each of them) presents us with a particular image of reality. Everything that
is (objects) is both a part of something greater, and is made of parts that are lesser. Hence everything plays two roles simultaneously, as a whole, constituent of its parts, and as a part, which
of itself is whole.
We tend to think of the lesser parts as whole, and hence together they lend wholeness to the greater part. Modern physics tells us that the smallest parts --subatomic --do not have a wholeness unto themselves. They are relatively undefined, a substance that emulates both "wave" and "particle" in nature. They appear differently depending on how they are viewed, so the role of observer cannot be ignored in their definition. And they are mostly "empty space."
Merelogical nihilism builds outward, and upward, ontologically from this image, saying that all the world is this wavy-particley thinginess, and what we perceive as parts/wholes are a result of imperfect perception of the wavy-particley thinginess. (That objects "do not exist" per the article is simply poor wording that means that they do not exist in the form that we think they do --as parts/wholes, "simples".)