P = superTrace(SM, R, L)
Let $A^{p|q}=Ax_1 \oplus \cdots \oplus Ax_p \oplus Ae_1\oplus \cdots \oplus Ae_q$ be a free module over $A$, where $x_i$s are even and $e_j$s are odd generators. A (homogeneous) morphism $T:A^{p|q}\rightarrow A^{r|s}$ has a matrix representation. Denote the matrix by $T$ then we have $T=\begin{pmatrix} T1&T2\\ T3&T4\end{pmatrix}$.
The super trace of $T$ is defined by $superTrace(T)= Trace(T_1)-(-1)^{p(T)} Trace(T_4)$. The inputs of this function are a SuperMatrix, a ring, which should have skew-symmetric variables, and a list, which is the list of skew-symmetric variables that are used in the superMatrixGenerator. In case that the superMatrix is homogeneous, the output is the super trace of the superMatrix.
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The object superTrace is a method function.