what does integral sign mean
The integral sign â« represents integration. The symbol dx (explained below) indicates the variable of integration, x. The function f(x) which is to be integrated is called the integrand. In correct mathematical typography, the dx is separated from the integrand by a space (as shown).iven a function f of a real variable x and an interval [a, b] of the real line, the definite integral. is defined informally as the signed area of the region in the xy-plane that is bounded by the graph of f, the x-axis and the vertical lines x = a and x = b.