# Tag Info

Mathematical Preliminaries First, let's do some mathematical manipulation. The equation you start with is: $$z-A|z|=b$$ We would like to reduce this to something we know how to solve, like a standard linear system: $$Ax=b$$ To do so, we introduce a diagonal matrix $S_z$ which we call the "signature matrix of $z$". Now, let the diagonal entries \$...