mnemonical การใช้

To assist in retaining the mnemonical words in the memory, they were formed into memorial lines.
In 1848, Kirkman published " First Mnemonical Lessons ", a book on mathematical mnemonics for schoolchildren.
Again, while a helpful guide, this is only mnemonical and not a property of tensors since the indices do not cancel like in equations, it is only a concept of the notation.
There is a ( partially mnemonical ) correspondence between index positions attached to "'L "'and in the partial derivative : " i " at the top and " j " at the bottom, in each case, although for Cartesian tensors the indices can be lowered.