Or Jean (1887-1966) French abstract painter and sculptor. He was one of the founders of the Dada movement 1916, and was later associated with the Surrealists. Using chance and automatism, Arp developed an abstract sculpture whose sensuous form suggests organic shapes.
In his early experimental works, such as collages, he collaborated with his wife Sophie Taeuber-Arp (1889–1943).
(1927-) US astronomer who has worked particularly on the identification of galaxies. He published Atlas of Peculiar Galaxies 1965. He also carried out the first photometric work on the Magellanic Clouds—the nearest extragalactic system.
Arp was born in New York and educated at Harvard and the California Institute of Technology. In 1953 he began research at the observatory on Mount Palomar, and after working at a number of other institutions returned there in 1969. During the 1980s he put forward some unorthodox views on the red shifts of quasars. In the ensuing controversy he left the Palomar Observatory and went to the Max Planck Institute for Astrophysics, near Munich, in Germany.
During his research on globular clusters, globular-cluster variable stars, novae, Cepheid variables, extragalactic nebulae, and so on, Arp has attempted to relate the listings of galaxies to radio sources; the optical identification of these sources can now be done fairly accurately. He is working with other astronomers on the question of whether the red shifts in the spectrum of quasars are due to the general expansion of the universe.
Acronym for Address Resolution Protocol. A TCP/IP protocol for determining the hardware address (or physical address) of a node on a local area network connected to the Internet, when only the IP address (or logical address) is known. An ARP request is sent to the network, and the node that has the IP address responds with its hardware address. Although ARP technically refers only to finding the hardware address, and RARP (for Reverse ARP) refers to the reverse procedure, ARP is commonly used for both senses. See also IP address, TCP/IP.
Address Resolution Protocol. An Internet protocol which runs on Ethernets and token rings and maps Internet addresses to MAC addresses.
City in Texas (USA); zip code 75750.