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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 ]
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+Crocker                                                         [Page 1]
+