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### 4. Formal Logic / G. Formal Mereology / 2. Terminology of Mereology

#### [technical vocabulary used in formal mereology]

11 ideas
 12822 Proper or improper part: x < y, 'x is (a) part of y' [Simons]
 12823 Overlap: two parts overlap iff they have a part in common, expressed as 'x o y' [Simons]
 12824 Disjoint: two individuals are disjoint iff they do not overlap, written 'x | y' [Simons]
 12825 Product: the product of two individuals is the sum of all of their overlaps, written 'x · y' [Simons]
 12826 Sum: the sum of individuals is what is overlapped if either of them are, written 'x + y' [Simons]
 12827 Difference: the difference of individuals is the remainder of an overlap, written 'x - y' [Simons]
 12828 General sum: the sum of objects satisfying some predicate, written σx(Fx) [Simons]
 12829 General product: the nucleus of all objects satisfying a predicate, written πx(Fx) [Simons]
 12830 Universe: the mereological sum of all objects whatever, written 'U' [Simons]
 12831 Atom: an individual with no proper parts, written 'At x' [Simons]
 12844 Dissective: stuff is dissective if parts of the stuff are always the stuff [Simons]