Partless particle

Partless particle (Tib. dultren chamé; Wyl. rdul phran cha med) - the indivisible particle of matter asserted by the Vaibhashika and Sautrantika schools. See also indivisible moment of consciousness.

Refutation

The partless particle is refuted by the Chittamatra school using the logic expressed in this famous verse from Vasubandhu's Twenty Stanzas:

When six other particles are joined to it,

The subtle particle will have six parts.

If the six all simply converge together,

Then even compounds will be infinitesimal.