X is a set of airports, and x, y are in X. xRy if there is a...
X is a set of airports, and x, y are in X. xRy if there is a...
X is a set of airports, and x, y are in X. xRy if there is a direct flight from airport x to airport y, and R is reflective, i.e. xRy is true if and only if yRx is true.
The transitive closur...
