2. Metric space is disconnected iff there exist a set which is both open & closed | in Hindi

Hi everyone !!! In this video we will study 2 theorems regarding disconnected and connected set. 1. A metric space (X,d) is disconnected iff there exist a subset of X which is both open & closed. 2. A metric space (X,d) is connected iff a) X is not union of two open set b) X is not union of two closed set