I came across a problem asserting that the(adsbygoogle = window.adsbygoogle || []).push({}); C-tensor product ofCandCand theR-tensor product ofCandCare isomorphic asQ-modules. How does this begin to make sense as they do not have the same dimension overR? The first is isomorphic toR^{2}and the second is isomorphic toR^{4}overR.

Also, I'm struggling with tensors. Does anyone have a good source I should check out? (I've tried many)

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# How are R^2 and R^4 isomorphic as VS's over Q?

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