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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 ]

Crocker [Page 1]