mutual-dependence is an n-ary operator. The meaning is notwell-defined right now. Eg: (mutual-dependence (stream-pressure
2d-stream-1) (stream-temperature 2d-stream-1) (specific-entropy
2d-stream-1) (specific-enthalpy 2d-stream-1) (specific-internal-energy 2d-stream-1) (specific-volume
2d-stream-1)) We don't know how to compute this yet. It will be a
call to an outside routine or a table lookup.