About Trace
In linear algebra, the trace of a square matrix A is defined to be the sum of elements on the main diagonal of A. The "trace" of a matrix is sum of the eigenvalues, and it is invariant with respect to a change of basis. This characterization can be used to define the "trace" of a linear operator in general.
Andrew Griggs in prison for the murder of the pregnant woman, Debbie
Feb 16,2020 7:40 am
... The body of Debbie Griggs, who disappeared without a Trace from the family home in Deal, Kent, on 5...
Early animal had 'complex behaviour'
Feb 16,2020 5:55 am
... But what s particularly noteworthy about it is that it s combining a Trace - the movement of an animal across the ancient sea floor - with the actual animal that did it...