Portree used Portree's pier as a rest point. The town also began exporting fish at this time, which contributed greatly to the local economy. The town had the last manual telephone exchange in the UK, which closed in 1976. Portree shale is a geologic association in the vicinity of Portree, the existence of which is linked with potential petroleum occurrences of commercial importance. Portree Portree (; , ) is the largest town on Skye in the Inner Hebrides of Scotland. It is the location for the only secondary school on the island, Portree High School. Public transport services are limited to
Principal branch This is the principal branch of the log function. Often it is defined using a capital letter, . Principal branch In mathematics, a principal branch is a function which selects one branch ("slice") of a multi-valued function. Most often, this applies to functions defined on the complex plane. Principal branches are used in the definition of many inverse trigonometric functions, such as the selection either to define that or that A more familiar principal branch function, limited to real numbers, is that of a positive real number raised to the power of . For example, take the relation , where