From 4a052b6f53406cbb9b78e66c1ff0b46c589aea85 Mon Sep 17 00:00:00 2001
From: Richard Kreckel <Richard.Kreckel@uni-mainz.de>
Date: Tue, 14 Aug 2001 21:09:16 +0000
Subject: [PATCH] - added comment about more recent terminology involving
 eta(x,y).

---
 ginac/inifcns.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ginac/inifcns.cpp b/ginac/inifcns.cpp
index 5ebd3d02..50ec3ec8 100644
--- a/ginac/inifcns.cpp
+++ b/ginac/inifcns.cpp
@@ -126,6 +126,8 @@ REGISTER_FUNCTION(csgn, eval_func(csgn_eval).
 
 //////////
 // Eta function: eta(x,y) == log(x*y) - log(x) - log(y).
+// This function is closely related to the unwinding number K, sometimes found
+// in modern literature: K(z) == (z-log(exp(z)))/(2*Pi*I).
 //////////
 
 static ex eta_evalf(const ex &x, const ex &y)
-- 
2.45.0