👉 In mathematics, "bourre" is a fundamental concept in algebraic topology. It refers to the property of being a closed and nowhere dense subset of a space. Boureaux are also known as Broussous or Bouchat's balls (after Pierre Broussau), which are the smallest open sets in a topological space that contain no point of the space but do not intersect any other set. They were introduced by Henri Broussau and Jean-Baptiste B