Typical things which nominalists snort at the existence of are numbers, properties, states of affairs, the note C-sharp, propositions, classes, sets, and distances. Some take the further step of denying the existence of space and time. I certainly do.
Nominalistic things refer to abstract concepts or ideas that do not have a physical existence in the world. They exist only in our minds and are dependent on language and human understanding.
The website is important because it provides a comprehensive list of resources and information about nominalism, including various arguments and theories about its nature and existence. It also includes critiques and responses to common objections.
The author of the website is Peter van Inwagen, a prominent philosopher and professor at the University of Notre Dame. He is known for his work on metaphysics, free will, and philosophy of religion.
Nominalistic things cannot be proven or disproven in the same way that physical objects can be. They are abstract concepts and do not have a physical presence that can be observed or measured. However, philosophers and scientists may use logical arguments and evidence to support or refute the existence of certain nominalistic things.
Nominalism differs from other philosophical theories, such as realism and conceptualism, in its rejection of the existence of abstract objects. Nominalists argue that these objects are merely a product of human language and understanding, rather than having an independent existence. This is in contrast to realists who believe that abstract objects have a real existence outside of human perception, and conceptualists who hold that these objects exist but only as concepts in the mind.