RFC154

Network Working Group S. Crocker Request for Comments: #154 UCLA NIC: #6759 12 May 1971 Categories: C.4 Updates: #107 Obsoletes: #132

                    Exposition Style

As a pedagogical device for describing functions such as the one below

       |
       |                  +-----------------
       |                 /:
       |                / :
       |               /  :
       |              /   :
       |             /    :
       |            /     :
  -----+------------------------------------
       |                  a
       |

where two formulae, f1 and f2, are necessary for adjoining domains but the function is continous at the boundary point, I usually write the description in the form

    f(x) = f1(x) for x =< a
    f(x) = f2(x) for x >= a

The astute reader will note that the domains overlap, but that f1(a) = f2(a), so no semantic ambiguity obtains.

 [ This RFC was put into machine readable form for entry ]
 [ into the online RFC archives by Naoki Matsuhira 5/97 ]