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in the book of bennet chow,the definition of the "*" notation is simple ,I can't understand . can someone gives me some examples of this definition? or tell me in which book I can find this?thanks.

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    @Yuri Vyatkin,thans very much!2011-11-17

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The notation $A*B$ is used for tensors $A$, $B$ to denote a linear combination of contractions of the tensors $A$ and $B$.