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Hi,

In Mod-01, Lec-02, beginning at 54:10 Balakrishnan discusses the 
"inverted oscillator" having energy 1/2 m qdot^2 - 1/2 m omega^2 q^2.
 
https://www.youtube.com/watch?v=8X1x9RLaaxc

Discussed further in Lec-03.

Is the "inverted oscillator" only fictitious?  If a realization 
exists, I must have a mental block to imagine it.

Thx,                           ... P.
 

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