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diff -r -U3 sympy-1.3.orig/sympy/functions/special/zeta_functions.py sympy-1.3/sympy/functions/special/zeta_functions.py
--- sympy-1.3.orig/sympy/functions/special/zeta_functions.py	2018-09-07 02:27:20.000000000 +0700
+++ sympy-1.3/sympy/functions/special/zeta_functions.py	2018-09-17 22:05:34.374733619 +0700
@@ -509,7 +509,7 @@
 
     For `\operatorname{Re}(s) > 0`, this function is defined as
 
-    .. math:: \eta(s) = \sum_{n=1}^\infty \frac{(-1)^n}{n^s}.
+    .. math:: \eta(s) = \sum_{n=1}^\infty \frac{(-1)^{n-1}}{n^s}.
 
     It admits a unique analytic continuation to all of :math:`\mathbb{C}`.
     It is an entire, unbranched function.