Being and Time mentioned in "Being and Time", has been identified by some with Heidegger's central notion of "Sorge" ("cura", care or concern). However, for Heidegger, "theoretical" knowledge represents only one kind of intentional behaviour, and he asserts that it is grounded in more fundamental modes of behaviour and forms of practical engagement with the surrounding world. Whereas a theoretical understanding of things grasps them according to "presence," for example, this may conceal that our first experience of a being may be in terms of its being "ready-to-hand." Thus, for instance, when someone reaches for a tool such as a hammer, their understanding
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