[" For quiral "m" site "n" an ferm "lim_(x rarr0)f(x)" att "lim_(x rarr1)f(x)(1)/(4)x+(1)/(x)" afferent "],[qquad f(x)={[mx^(2)+n,,x<0],[nx+m,,0<=x<=1],[nx^(3)+m,,x>1]]