I Zero Element in a Ring: The 0 Ring Has Only One Element

chwala
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Am just but refreshing (kindly see highlihted part)
1690386646773.png


...this element ##r## can only be ##0## correct? The zero ring has only one element which is ##0##.
 
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Yes.
 
Thread 'Derivation of equations of stress tensor transformation'

Thread 'Derivation of equations of stress tensor transformation'

Hello ! I derived equations of stress tensor 2D transformation. Some details: I have plane ABCD in two cases (see top on the pic) and I know tensor components for case 1 only. Only plane ABCD rotate in two cases (top of the picture) but not coordinate system. Coordinate system rotates only on the bottom of picture. I want to obtain expression that connects tensor for case 1 and tensor for case 2. My attempt: Are these equations correct? Is there more easier expression for stress tensor...
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