function Nov6()
% This problem gives a nice concrete look at local truncation error

% Fact 1:  
%          y_{k+1} = y_{k} + (h/2)*(3*f(t_{k},y_{k}) - f(t_{k-1},y_{k-1})
%                  = y_{k} + (h/2)(3*A*y_{k} - A*y_{k-1})
% Fact 2:
%          y(t) = exp(At)y(0) = (I + At + ((At)^2)/2 + (At)^3/3! +...)y(0)
% Fact 3:
%          y_{k}   = exp(khA)
%          y_{k-1} = exp((k-1)hA) 
% Fact 4:
%          y_{k+1} = (I +(3h/2)A - (h/2)Aexp(-Ah))y(kh)
% Fact 5:
%          y_{k+1} = (I + hA + (h^2/2)A^2 + O(h^3))y(kh)
% Fact 6:
%          y_{k+1} - y((k+1)h) = O(h^3)    
% Fact 7   Give a precise recipe for the O(h^3) term