In the linear format of UTN #28, 1/2/3/4 builds up as ((1/2)/3)/4 as in computer languages like C. The notation actually started with C semantics and then added a larger set of operators, and finally adopted the full Unicode set of mathematical operators. You can try it out in Microsoft Office applications. Different groupings can be obtained by using parentheses, which may be discarded after build up as explained in UTN #28. As Asmus points out, I started working on this notation back in the late 1970's and the latest version is built into a number of popular products. So it's pretty thoroughly tested.
Murray
