From: Jors Dolderer on 30 Apr 2010 13:07 Hi, I wondered if a formal language exists where nobody ever had thought of a problem you can't describe in it. When I see something coming from the keyboard of a mathematician, I often see a notation with inverted Es and As - I gained some google- half-education about that, but I don't see how to formulate e.g. "The Halting problem is undecidable" in such a language. Is this possible? If yes: How? If no: Are there attempts to make this possible? Of course, I don't mean attempts of the form "Be H the Halting problem and D(X) the statement 'X is decidable.' Now we can - waow - state 'The Halting problem is decidable'". Greets Joris
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