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A third worry, which applies to all (restricted or unrestricted) composition principles, is this.
In other words, fully unrestricted composition calls for extensionality, on pain of giving up both supplementation principles.
Bohn (forthcoming) advocates composition as identity and argues that this entails unrestricted composition (which of course rules out junk).
First, McTaggart endorses unrestricted composition: whenever there are some substances, there is a further substance that is composed of them.
In fact, if composition is in some sense a form of identity, then the charge of ontological extravagance discussed in connection with unrestricted composition loses its force, too.
McTaggart dismisses the worry that unrestricted composition implies that there are bizarre substances such as the substance composed of all the readers of the SEP and the moon.
Similar(44)
However, opponents of unrestricted mereological composition are unsurprisingly unconvinced: "what does 'nothing over and above' mean?
Many four-dimensionalists subscribe to a principle that a number of writers call unrestricted mereological composition.
Universalism also known as conjunctivism or unrestricted mereological composition (or UMC is the thesis that, for any plurality of non-overlapping objects, those objects compose something.
Those who believe in unrestricted mereological composition think that the existence of the atoms entails the existence of the fusions, and their opponents do not.
Anyone who denies unrestricted mereological composition, for example, will deny 2. And the defender of strong pluralism in the material constitution debate (i.e. one who defends the view that there can be all-time coincident entities) will deny 3.
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