Definition talk:Borel Sigma-Algebra

Worth adding a separate definition for a Borel $\sigma$-algebra generated by open sets in a metric space? It's immediate if the reader is familiar with topology, but the question is whether there are readers that know about open sets in a metric space setting but hasn't learned general topology yet. --GFauxPas (talk) 14:10, 31 May 2018 (EDT)