Theorem : union of open sets is open | union of arbitrary collection of open set is open |

[@alientv6707]

best video on this topic

[@GauravSingh-sp2nz]

sir you are genius believe it sir

[@anubhavsingh9197]

best
thanks sir

[@Epselon-plus-plus]

So nice of you

[@maskman4770]

how you prove the theorems so easily