Several new classes of discrete stochastic orderings are introduced for comparing discrete random variables that are valued in an arbitrary ordered finite grid of nonnegative points. These order ...

Convex and concave lenses can both be used to correct defects of vision. The most commonly occurring defects of vision are ‘short sightedness’ and ‘long sightedness’. People who are ‘short sighted’ ...

Large-area dinosaur footprints from the dinosaurs from Late Cretaceous, which were rarely preserved in both concave and convex slabs, have been discovered in East China's Fujian Province. Experts said ...