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## Main Question or Discussion Point

Hi can someone help me prove this identity? I'm having trouble understand the role of the interior product or more precisely how to calculate with it.

My professor uses the "cut" notation _| but i don't see this in any text books. Can someone give me some hints on how to prove the identity?

My professor uses the "cut" notation _| but i don't see this in any text books. Can someone give me some hints on how to prove the identity?