First Countable Space | Second Countable Space | Every Second Countable Space is First Countable

00:22 - What is First Countable Space? 02:08 - What is Second Countable Space? 03:52 - Prove that every second countable space is first countable but the converse of this statement is not true in general. What is First Countable Topological Space? What is Second Countable Topological Space? Every Second Countable space is first Countable. The first countable space may not be the second countable. Previous Lecture linked with this video https://youtu.be/GiNFKbE3SXk