- Berkeley(as the author being discussed)
- George Berkeley was an Irish philosopher from the 1600s-1700s who argued that physical objects don't exist independently of being perceived—they only exist because someone is thinking about or observing them.
- Mental particulars(as examples of things that have properties like redness without physical form)
- Specific individual things that exist only in the mind, like your thoughts, feelings, or imagined objects.
- Universal properties(as qualities that don't require physical space)
- Qualities or characteristics that can apply to many different things (like 'redness' or 'roundness' that multiple objects can share).
- idealism(Presented as a consequence of the coherence theory of truth, but not exclusive to it)
- The view that one's beliefs constitute the world
- instantiate(as used in metaphysics)
- To be a concrete example of something, or to have and display a particular property or category.
- necessary condition(Counterfactual analysis of causation; Mackie 1965, 1974)
- A condition C is necessary for event E if E would not have occurred in the absence of C
- spatial extension(describing properties of physical bodies)
- The idea that something takes up space—it has length, width, and depth. For physical objects, this is a basic feature of what makes them physical.