Hi, old newbie here

Welcome to AK! Your avatar makes me think that you live in the Hilbert space!

Thank you!

For anyone who wondered what it means (all three of you), it is the reduced Planck's Constant as a 'vector' (*) in Dirac (ket) notation. But guiller obviously knew that.

* A physical vector is not the same as a mathematical vector, although the same methodologies apply.

And that is about all I remember.
 
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