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## Main Question or Discussion Point

Hi:

There are 3 invariants. The first one is a trace. The third one is a determinant. So they are invariants.

The strange thing is the 2nd one. It is a hybrid term. Why is it also an invariant?

There are 3 invariants. The first one is a trace. The third one is a determinant. So they are invariants.

The strange thing is the 2nd one. It is a hybrid term. Why is it also an invariant?