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Philadelphia, commonly referred to as Philly, is the most populous city in the U.S. state of Pennsylvania [11] and the sixth-most populous city in the nation, with a population of 1,603,797 in the 2020 census. The city is the urban core of the larger Delaware Valley, also known as the Philadelphia metropolitan area, the nation's seventh-largest ...
Neighborhoods of Alexandria, Virginia. Alexandria, Virginia is an independent city in the Commonwealth of Virginia, located along the western bank of the Potomac River. The city of approximately 151,000 is about six miles (9.6 kilometers) south of downtown Washington, D.C. Several outlying neighborhoods and cities outside the limits of ...
Geography A map of Upper Manhattan, with Greater Harlem highlighted.Harlem proper is the neighborhood in the center. Harlem is located in Upper Manhattan.The three neighborhoods comprising the greater Harlem area—West, Central, and East Harlem—stretch from the Harlem River and East River to the east, to the Hudson River to the west; and between 155th Street in the north, where it meets ...
Hash table. A small phone book as a hash table. In computing, a hash table, also known as a hash map or a hash set, is a data structure that implements an associative array, also called a dictionary, which is an abstract data type that maps keys to values. [2] A hash table uses a hash function to compute an index, also called a hash code, into ...
Map of stars cataloged by the Gaia release in 2021, displayed as density mesh in the diagram. The ESA spacecraft Gaia provides distance estimates by determining the parallax of a billion stars and is mapping the Milky Way with four planned releases of maps in 2016, 2018, 2021 and 2024. Data from Gaia has been described as "transformational".
Neighborhoods of Portland, Oregon. Map of Portland, Oregon's five sections, prior to the creation of South Portland in 2020. Portland, Oregon is divided into six sections: North Portland, Northeast Portland, Northwest Portland, South Portland, Southeast Portland, and Southwest Portland. There are 95 officially recognized neighborhoods, each of ...
Hegewisch, Chicago. Baltimore Avenue is the main commercial street of Hegewisch. / 41.6600°N 87.5500°W / 41.6600; -87.5500. Hegewisch (pronounced / ˈhɛɡˌwɪʃ / "heg-wish" by the locals) is one of the 77 community areas of Chicago, Illinois, located on the city's far south side. It is bordered by the neighborhoods of Riverdale and ...
The particular point topology on any infinite set is locally compact in senses (1) and (3) but not in senses (2) or (4), because the closure of any neighborhood is the entire space, which is non-compact. The disjoint union of the above two examples is locally compact in sense (1) but not in senses (2), (3) or (4).