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Euler introduced the term affine (Latin affinis, "related") in 1748 in his book "Introductio in analysin infinitorum." Felix Klein's Erlangen program recognized affine geometry as a generalization of Euclidean geometry.
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Felix was the Roman procurator (governor) of Judea between 52 and 58/59 CE.
Laboratory tests. the Weil-Felix test. This test is based on the fact that some of the antibodies that are formed in the body during a rickettsial infection can react with certain strains (OX-2 and OX-19) of Proteus bacteria and cause them to clump
To illustrate that a solid object need not have a distinct inside and outside. This has important implications for topology.