Four Decades of TeX at zbMATH

Four key decades

main greenhouse gas is continuing to increase in the atmosphere at an alarming rate. The level of the gas at the Zeppelin research station in Svalbard peaked at more than 397 ppm, an increase of more than 2.5 ppm on 2008. Carbon dioxide levels at Svalbard tend to be higher than the global average, but scientists said the carbon dioxide level they had measured was unprecedented, even for that lo...

Four Decades of Scientific Explanation

The search for scientific knowledge extends far back into antiquity. At some point in that quest, at least by the time of Aristotle, philosophers recognized that a fundamental distinction should be drawn between two kinds of scientific knowledge—roughly, knowledge that and knowledge why. It is one thing to know that each planet periodically reverses the direction of its motion with respect to t...

Four Decades of AI in Portugal

Four decades of stroke prevention trials.

M edical students in the 1940s observed that stroke victims were regarded as in a hopeless situation. Severely disabled patients with stroke and those in coma from intra-cerebral clots were confined to Observation Units. What was learned in my early days allowed us to replace this Medical Bedlam with Stroke Prevention and Treatment Units. Stroke neurologists, specialized nurses, and imaging tec...

Four Decades of Mathematical System Theory

As a follow-up to the volume Three Decades of Mathematical System Theory that the authors of this paper edited in 1989 at the occasion of the ...ftieth birthday of Jan Willems, we discuss some trends that have become more visible in the past decade. It is argued that system theory is ready to play a role in many di¤erent ...elds of science. Three examples of nontraditional application areas are...