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Update README.md
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wanko authored Nov 10, 2023
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Expand Up @@ -19,7 +19,7 @@ fclingo is an extension of [clingo](https://github.com/potassco/clingo) and acce
fclingo relies on the constraint answer set programming (CASP) solver [clingcon](https://github.com/potassco/clingo) into whose language a fclingo program is translated. fclingo's two main advantages are foundedness of the integer variables and aggregates over integer variables. The former allows variables to be undefined and only assume a value if a reason for that value can be derived. This differs to the behavior of CASP, where variables are always defined and in absence of any constraint to a variable, all possible values are enumerated. The latter generalizes ASP aggregates to contain integer variables that are not subject to grounding.

### Output
The answer sets of fclingo programs contain symbols `val(x,v)`, where `x` is an integer variable occurring in the program and `v` is the integer value of the variable in the answer set. The absence of such an atom means the variable is undefined.
The answer sets of fclingo programs contain terms `val(x,v)`, where `x` is an integer variable occurring in the program and `v` is the integer value of the variable in the answer set. The absence of such a term means the variable is undefined.

### Language overview
fclingo atoms have the following form:
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