See this sibling comment for context https://news.ycombinator.com/item?id=24948188 https://news.ycombinator.com/item?id=24948188 The definition you are looking

See this sibling comment for context https://news.ycombinator.com/item?id=24948188 https://news.ycombinator.com/item?id=24948188 The definition you are looking for is very well established and intensely studied in physics and theoretical computer science. This is a good place to start a wikipedia exploration of the topic: https://en.wikipedia.org/wiki/Church%E2%80%93Turing_thesis https://en.wikipedia.org/wiki/Church%E2%80%93Turing_thesis