Reflective Higher-Order Calculus, or Rho calculus for short, is a mathematical theory first proposed by Greg Meredith and Matthias Radestock in 2005.
Rho calculus was created as an extension of π-calculus, which is an open procedure that provides a theory of processes when provided a theory of names. Instead of this open theory, Rho calculus is a closed theory of processes, meaning that in Rho calculus the theory of names arises from and is wholly determined by the theory of processes.
Co-founder Greg Meredith worked extensively on a Microsoft's BizTalk Process Orchestration Engine, an application integration platform that implements higher-order calculus in its execution engine. Meredith then went on to found a blockchain smart contract platform based on Rholang, named Rchain.
Adventures in the Rho Calculus - reinman - Medium
Introduction to Rho Calculus
RChain Platform Architecture -- RChain Architecture 0.9.0 documentation
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