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Is it correct of me to say that I want to carry out the sum

[tex]

\sum_i{v_iw_i}

[/tex]

where [itex]i\in\{x,y,z\}[/itex]? Or is it most correct to say that [itex]i=\{x,y,z\}[/itex]?

Best regards,

Niles.

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# Proper summation notation

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