r for 
% the value of the function:
% 
% $$y = y(h), l = l(h), u = u(h)$$
% 
% Or maybe even more letters:
% 
% $$y = PROD(h), l = LEIS(h), u = UTIL(h)$$
% 
% Or perhaps different single letters than the output:
% 
% $$y = f(h), l = g(h), u = v(h)$$
% 
% Each notation structure could be confusing, make sure you are clear about 
% what your notations mean. Math should help make our ideas more clear to ourselves 
% and others, and that starts with clear functional notations.
% 
% 
% 
% 
% 
%
##### SOURCE END 