function [g,h]=restr(x)
% Edgar & Himmelblau, 1988
% x0 = [-1, -2]'
% xo = [0.8229, 0.9114]'
% S(xo) = 1.3935

g=(x(1).^2)/4+x(2).^2-1;
h=x(1)-2*x(2)+1;
