Lexicon of Arguments

Philosophical and Scientific Issues in Dispute
 
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Schwarz I 79f
Mereology: quantities are not the sums of their elements - sum of a single thing A is A the thing itself - but the singleton set {A} is never identical with A.
>Singleton, >Unit set.
- - -
IV 44
Counterpart/Couples/Mereology/Lewis: Example twin brothers Dee and Dum in the actual world. Their pair can be seen as a mereological sum.
The couple as mereological sum is a possible individual, not a quantity. Then the counterpart theory can be applied without modification.
- - -
V 258
Event/Mereology/Logic/Part/Logical Relation/Lewis: we have seen that an event in one sense can be part of another event.
1. then, as I suggest, they have a mereology like they all have classes: the parts of classes are the subclasses. (>Subsets).
2. in another sense they have another mereology: regions can be spatiotemporal parts of other regions. Events are classes of regions, the mereology of the elements transfers to the classes, in the sense that events can also be spatiotemporal parts of each other.
V 260
Def Overlap/Event/Mereology/Lewis: two events overlap when they have an event as a common part. An atomistic event has no events except itself as part.
Def mereological sum/event/mereology/Lewis: an event e is the mS of events f1,f2... then and only if e overlaps all and only those events that overlap at least one of the fs.
Principles/Mereology/Event/Lewis: Question: are the principles here
a) the same as that of the unlimited mereology of individuals, in which individual individuals always have a different individual as their sum? Or is it
b) the limited mereology of e.g. chairs, in which several chairs rarely or never have another chair than their sum? (>subset/>Sets.
Lewis: Thesis: Events have a more accessible mereology than e.g. chairs:
For example a war can be a mereological sum of battles,
For example, a conference the sum of its meetings.
But we leave open whether events, however diverse, must always have other events as parts. It depends on whether one allows unlimited sums, so that there is no limit to how large and non-uniform an event may be, or whether one demands a certain unity for it (limited mereological sum).
Perhaps the sum provides a property that is formally suitable for regions, but not an event. This is hard to decide. Our events should serve as causes and effects.

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