# HG changeset patch
# User jwe
# Date 967007868 0
# Node ID 0c7f2dda1d1aa5d2f7ab10c24f3604575eb80940
# Parent  7066a8065e7e84e3458e5340624b11dfaac79bf1
[project @ 2000-08-23 05:17:48 by jwe]

diff --git a/PROJECTS b/PROJECTS
--- a/PROJECTS
+++ b/PROJECTS
@@ -23,7 +23,11 @@
 
   * Improve logm, and sqrtm.
 
-  * Improve complex mapper functions.
+  * Improve complex mapper functions.  See W. Kahan, ``Branch Cuts for
+    Complex Elementary Functions, or Much Ado About Nothing's Sign
+    Bit'' (in The State of the Art in Numerical Analysis, eds. Iserles
+    and Powell, Clarendon Press, Oxford, 1987) for explicit
+    trigonometric formulae.
 
   * Make functions like gamma() return the right IEEE Inf or NaN
     values for extreme args or other undefined cases.