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The Luhn algorithm or Luhn formula, also known as the "modulus 10" or "mod 10" algorithm, named after its creator, IBM scientist Hans Peter Luhn, is a simple check digit formula used to validate a variety of identification numbers. It is described in US patent 2950048A, granted on 23 August 1960. [1]
A 1740 map of Paris. Ortelius World Map, 1570. Historical geography is the branch of geography that studies the ways in which geographic phenomena have changed over time. [1] In its modern form, it is a synthesizing discipline which shares both topical and methodological similarities with history, anthropology, ecology, geology, environmental studies, literary studies, and other fields.
903 Dictionaries, encyclopedias, concordances of history; 904 Collected accounts of events; 905 Serial publications of history; 906 Organizations and management of history; 907 Education, research, related topics of history; 908 History with respect to groups of people; 909 World history; 910 Geography and travel. 910 Geography and travel; 911 ...
Unit 2: Networks of Exchange: 8–10% Unit 3: Land-Based Empires: c. 1450 to c. 1750: 12–15% Unit 4: Transoceanic Interconnections: 12–15% Unit 5: Revolutions: c. 1750 to c. 1900: 12–15% Unit 6: Consequences of Industrialization: 12–15% Unit 7: Global Conflict c. 1900 to the present 8–10% Unit 8: Cold War and Decolonization 8–10% ...
In more recent developments, geography has become a distinct academic discipline. 'Geography' derives from the Greek γεωγραφία – geographia, [1] literally "Earth-writing", that is, description or writing about the Earth. The first person to use the word geography was Eratosthenes (276–194 BC).
Transylvania is a historical region in central and northwestern Romania.It was under the rule of the Agathyrsi, part of the Dacian Kingdom (168 BC–106 AD), Roman Dacia (106–271), the Goths, the Hunnic Empire (4th–5th centuries), the Kingdom of the Gepids (5th–6th centuries), the Avar Khaganate (6th–9th centuries), the Slavs, and the 9th century First Bulgarian Empire.
Advanced Placement (AP) Human Geography (also known as AP Human Geo, AP Geography, APHG, AP HuGe, AP HuG, AP Human, HuGS, or HGAP) is an Advanced Placement social studies course in human geography for high school, usually freshmen students in the US, culminating in an exam administered by the College Board. [1]
The four traditions of geography have been widely used to teach geography in the classroom as a compromise between a single definition and memorization of many distinct sub-themes. [2] [5] There are many competing methods to organize geography. [6] The original four traditions have had several proposed changes. [5] [6]