Is a hot dog a sandwich? Let's examine one of the hardest problems in metaphysics to find out. Because THUNK.
Links for the Curious
The Stanford Encyclopedia of Philosophy is invaluable for getting a broad understanding of this topic quickly. Some key pages I found helpful:
Metaphysics Overview - https://plato.stanford.edu/entries/me...
Platonism in Metaphysics - https://plato.stanford.edu/entries/pl...
Abstract Objects - https://plato.stanford.edu/entries/ab...
Nominalism in Metaphysics - https://plato.stanford.edu/entries/no...
Tropes - https://plato.stanford.edu/entries/tr...
The n-tuple representation of tropes was from “Tropes: Properties, Objects, & Mental Causation” by Douglas Ehring - http://goo.gl/zzYJpp
Is This a Sandwich? Teaching the Platonic Dialogues through sandwiches (M Ritchey, 2014) - / is-this-a-sandwich
A Bro And A Philosopher Debate The True Meaning Of A Sandwich (Scherer, 2015) - https://firstwefeast.com/eat/2015/04/...
Also, I sorta gloss over defining metaphysics, which is a challenging work of philosophy in its own right - • What is Metaphysics? - Gentleman Thinker
"There Exists An X, X is a Sandwich," by Joel K Jensen (thanks, grammaticalcrimes!) - http://goo.gl/zX7wcc