Here we some definition of
Open sphere
Open set
Open Mapping
Next Video :- Open Mapping Theorem:
https://youtu.be/MiKnT_pjUd8
Functional analysis
Banach Space Playlist :- https://www.youtube.com/playlist?list=PL8HByMi5awLqAurKX4H1QqN4KFWO3u_gi
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