maryamapplebery8488 maryamapplebery8488 11-04-2024 Mathematics contestada Let A be a nonempty subset of Rⁿ. If the characteristic function of A is continuous, prove that bdA= phi, where f:Rⁿ→R is defined by f(vec(u))=1 if vec(u)inA and f(vec(u))=0 if vec(u)!inA?