hi, Initially I would like to ask a little and basic question: I know that $$v=\sum_{i=0} e_i v^i$$ where $$v^i=e^i v$$ But sometimes I think we can write the first equation like $$v=\sum_{i=0} e_i e^i v$$, and I am aware that $$e_i e^i=1$$ , then our equation becomes $$v=\sum_{i=0} v$$, ın short if we take the sum over i at the end, our equation becomes v=3v or v=5v.......Could you help me get over this confusion I have sometimes in my mind??? Very thanks in advance....(adsbygoogle = window.adsbygoogle || []).push({});

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# I Covariant and contravariat components

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