Thank you dear,I got that in case of working with metric there is no difference between covariant and contravarient tensor but if we are not dealing with metric then ?
On Fri, Dec 19, 2014 at 1:36 PM, Francesco Bonazzi <[email protected]> wrote: > > On Friday, December 19, 2014 7:20:58 AM UTC+1, Alok Gahlot wrote: > >> Dear member of the groups , i have a problem i basics ., my question is >> what is the difference in contravariant and covariant tensor >> > > http://en.wikipedia.org/wiki/Covariance_and_contravariance_of_vectors > > For questions about math itself I would suggest you to use mathoverflow. > > and how can we decide to choose tensor in any problem? what is the rule >> by which we know that we use covariant or contravariant or mixed tensor ? >> > > If you have a metric, covariant and contravariant representations are > equivalent (you can raise/lower the index by using the metric), so it > doesn't really matter. Anyways, it depends on what you are working with. > > -- > You received this message because you are subscribed to a topic in the > Google Groups "sympy" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/sympy/CTu8ajglYDE/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/918a6c47-150d-4f2e-91c5-d6b3328b5d13%40googlegroups.com > <https://groups.google.com/d/msgid/sympy/918a6c47-150d-4f2e-91c5-d6b3328b5d13%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- With regards, Dr. Alok Gahlot Department Of Mathematics +91 9897514806 -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAPue%3DPkqjx7CAZNJ4eQFkNTXy29cSEaX8Q8B98TP4R_1rxE%2B5Q%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
