Even so, two major barriers, typical of most transport equations, not just PBEs, have limited this potential ... Computational efficiency, which aligns with our overarching goal of reducing the ...

Mathematicians have been trying to solve this problem, too, ever since 1966 ... provided a more conceptual description of Gerver’s sofa. He wrote down a set of 22 equations that had 22 different ...

Large trolleys and suitcases are essential for long trips, but the right choice depends on practicality, comfort and means of transport. Here's how to find the perfect one.