Relationship between tensors

sparkster
Messages
153
Reaction score
0
Is there any relationship between tensors, as they're used in diff geo and the notion of tensor product as used in module theory? I seem to recall that tensor products were "invented" because, given a field k and U, V two vector spaces over k such that dim U=n, dim V=m, we wanted to construct a vector space with dimension nm.

But I'm not sure where tensors used the other way came from, thus my question.
 
Physics news on Phys.org
Yes there is, the tensor fields as used in differential geometry are constructed by taking sections of the tensor product of copies of the tangent bundle and cotangent bundle. The tensor product is also important in that it is used as a starting point to define the exterior product of covectors.
 
Hello! There is a simple line in the textbook. If ##S## is a manifold, an injectively immersed submanifold ##M## of ##S## is embedded if and only if ##M## is locally closed in ##S##. Recall the definition. M is locally closed if for each point ##x\in M## there open ##U\subset S## such that ##M\cap U## is closed in ##U##. Embedding to injective immesion is simple. The opposite direction is hard. Suppose I have ##N## as source manifold and ##f:N\rightarrow S## is the injective...
Back
Top