Being and Time raises the problem of "authenticity," that is, the potentiality or otherwise for mortal "Dasein" to exist "fully" enough that it might actually understand being. Heidegger is clear throughout the book that nothing makes certain that "Dasein" is capable of this understanding. Finally, this question of the authenticity of individual "Dasein" cannot be separated from the "historicality" of "Dasein". On the one hand, "Dasein", as mortal, is "stretched along" between birth and death, and thrown into its world, that is, thrown into its "possibilities", possibilities which "Dasein" is charged with the task of assuming. On the other hand, "Dasein's" access to
Albinus (philosopher) of Plato into four classes, logical, critical, physical, ethical, and mentions another division of them into Tetralogies, according to their subjects. He advises that the Alcibiades, Phaedo, Republic, and Timaeus, should be read in a series. Some of Albinus's fame is attributed to the fact that a 19th-century German scholar, J. Freudenthal, attributed Alcinous's "Handbook of Platonism" to Albinus. This attribution has since been discredited by the work of John Whittaker in 1974. Another Albinus is mentioned by Boethius and Cassiodorus, who wrote in Latin some works on music and geometry. Albinus (philosopher) Albinus (; fl. c. 150 AD) was