since the 19th century, opium has been produced and consumed in the areas of asia, currently referred to as the golden crescent and the golden triangle (1). the golden crescent lies in south and southwest asia, including districts in the northwest frontier province of pakistan, the adjacent badakhshan area of afghanistan and the baluchistan area of iran. the area has been the scene of tradition...

The Dirac delta function has solid roots in 19th century work in Fourier analysis by Cauchy and others, anticipating Dirac’s discovery by over a century.