But lecturer said today that it's a function.(adsbygoogle = window.adsbygoogle || []).push({});

So for example he said, if we have w x f where x is supposed to be tensor product, then w(f) x f can be written w(f)f without tensor product sign because w(f) is just a function...

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# I thought w(f) where w=dual vector f=vector is Reals?

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