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Antenna (electromagnetism)
A conductor whose purpose is to emit and/or receive electromagnetic waves using the bulk oscillations of electric charges within the conductor. The conduction electrons in antennas are free to move throughout the conductor. The electrons form a bulk…
Biography
Apollonius of Perga (c. 245–c.190 BC)
Biography
Archimedes (c. 287–212 BC)
Biography
Argand, Jean Robert (1768–1822)
Biography
Aristarchus of Samos (c. 320–c. 250 BC)
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Artificial intelligence
The subfield of computer science concerned with understanding the nature of intelligence and constructing computer systems capable of intelligent behavior. Many activities, such as perception, learning, planning, natural language, and understanding,…
Biography
Artin, Emil (1898–1962)
Biography
Avicenna (980–1037)
Biography