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Sri Lanka map of Köppen climate classification The climate is tropical and warm because of moderating effects of ocean winds. Mean temperatures range from 17 °C (62.6 °F) in the central highlands , where frost may occur for several days in the winter, to a maximum of 33 °C (91.4 °F) in low-altitude areas.
In general topology, a subset of a topological space is perfect if it is closed and has no isolated points. Equivalently: the set is perfect if , where denotes the set of all limit points of , also known as the derived set of . In a perfect set, every point can be approximated arbitrarily well by other points from the set: given any point of ...