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10:20
Thank you
@vidyarthi
How do I find $||ST||$ and $||TS||$?
When I took $x(s)=1$, I can prove $||S||=1$ and ||T||=1$
I could prove $||ST||\leq 1$ and $||TS||\leq 1$
@vidyarthi
How do I find $|| .||$?
Is there any short cut?

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