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On Apr 22, 2012, at 11:22 AM, Robert Virding <robert.virding@erlang-solutions.com> wrote:

> Without a clear deterministic definition of the language it can be basically impossible to determine what your program does. It also becomes impossible to reason about.

Go read Dijkstra or Gries. Their control flow constructs were non-deterministic.

Basically, in this case, you have to stop thinking of the program as being in a specific state but rather in one of a set of states and you reason in terms of properties of that set.

Mark