Graffiti it is a rapidly developing art form whose value is highly contested and reviled by many authorities while also subject to protection, sometimes within the same jurisdiction. Both "graffiti" and its occasional singular form "graffito" are from the Italian word "graffiato" ("scratched"). "Graffiti" is applied in art history to works of art produced by scratching a design into a surface. A related term is "sgraffito", which involves scratching through one layer of pigment to reveal another beneath it. This technique was primarily used by potters who would glaze their wares and then scratch a design into it. In ancient times
Singular measure Singular measure In mathematics, two positive (or signed or complex) measures "μ" and "ν" defined on a measurable space (Ω, Σ) are called singular if there exist two disjoint sets "A" and "B" in Σ whose union is Ω such that "μ" is zero on all measurable subsets of "B" while "ν" is zero on all measurable subsets of "A". This is denoted by formula_1 A refined form of Lebesgue's decomposition theorem decomposes a singular measure into a singular continuous measure and a discrete measure. See below for examples. As a particular case, a measure defined on the Euclidean space