Tricky way to control over dummy indices
Dear all, in expression { indexed(A, i, j) * indexed(B, j, k) } GiNaC is saying that the dummy index is "j" and "i, k" are free. Is there a way to determine dummy indices based on Einstein summation notation; namely all the indices in the latter be free. All the bests, Esa
On Fri, 14 Jul 2017 22:54:35 +0430, esarcush esarcush <esarcush@gmail.com> said:
EE> Dear all, in expression EE> { indexed(A, i, j) * indexed(B, j, k) } EE> GiNaC is saying that the dummy index is "j" and "i, k" are EE> free. Is there a way to determine dummy indices based on EE> Einstein summation notation; namely all the indices in the EE> latter be free. My understanding of https://en.wikipedia.org/wiki/Einstein_notation is that in the above expression there is summation over j, thus it is not free. -- Vladimir V. Kisil http://www.maths.leeds.ac.uk/~kisilv/ Book: Geometry of Mobius Transformations http://goo.gl/EaG2Vu Software: Geometry of cycles http://moebinv.sourceforge.net/
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esarcush esarcush
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Vladimir V. Kisil