Mereology – the study of parts and wholes

This looks inter alia at whether everything must be something, and at metaphysical questions such as ‘Everything and Nothing’. Heidegger talks about ‘nothing’ or ‘all’ in his philosophy. Nothing is contradictory, ineffable and the ground of everything. Husserl also had this way of looking at things. Anything can be a thing (anything) and it can be a quantifier or a substantive, or it can be both. Parts overlap. Some objects do not exist but are postulated. The mereological sum of a bunch of objects is you get when you put those things together