Rejecting substance requires defining mind as a structured group of events connected by memory.

Evidence

As for ‘mind’, when substance has been rejected a mind must be some group or structure of events. … We might—though this would be rather unduly simple—define a ‘mental’ event as one which remembers or is remembered. Then the ‘mind’ to which a given mental event belongs is the group of events connected with the given event by memory-chains, backwards or forwards. — Bertrand Russell, History of Western Philosophy, 2404

Categorization

• corroborated: 2 independent passages support this claim — Bertrand Russell, History of Western Philosophy, 2404
• XREF: connects to: Parmenides argued that language and thought require persistent existing objects — Bertrand Russell, History of Western Philosophy, 281; Language creates consciousness of self as separate from the environment.

Broader Connections

• Parmenides argued that language and thought require persistent existing objects #contradicts (0.85) — Bertrand Russell, History of Western Philosophy, 281
• Language creates consciousness of self as separate from the environment. #responds-to (0.75)