It is twenty-five years since the posthumous publication of David Marr's book Vision[1]. Only 35 years old when he died, Marr had already dramatically influenced vision research. His book, and the series of papers that preceded it, have had a lasting impact on the way that researchers approach human and computer vision.

After having been appeared, Egerváry was perhaps the first who responded to Purcell’s paper in 1957. Later in a posthumous paper he returned to the method in 1960, showing that it could be derived from his rank reduction procedure. We review here Purcell’s method in connection with Egerváry’s activity and also, we give a short survey on subsequent developments.

It is possible to retrieve viable sperm from a dying man or from a recently dead body. This sperm can be frozen for later use by his wife or partner to produce his genetic offspring. But the technical feasibility alone does not morally justify such an endeavour. Posthumous semen retrieval raises questions about consent, the respectful treatment of the dead body, and the welfare of the child to ...

Bertalanffy's so-called "general system theory" (GST) and cybernetics were and are often confused: this calls for clarification. In this article, Bertalanffy's conceptions and ideas are compared with those developed in cybernetics in order to investigate the differences and convergences. Bertalanffy was concerned with first order cybernetics. Nonetheless, his perspectivist epistemology is also ...