1 files changed, 59 insertions, 3 deletions
diff --git a/Doc/library/math.rst b/Doc/library/math.rst
index c760701..ec3955d 100644
--- a/Doc/library/math.rst
+++ b/Doc/library/math.rst
@@ -97,15 +97,23 @@ Number-theoretic and representation functions
    <http://code.activestate.com/recipes/393090/>`_\.
 
 
+.. function:: isfinite(x)
+
+   Return ``True`` if *x* is neither an infinity nor a NaN, and
+   ``False`` otherwise.  (Note that ``0.0`` *is* considered finite.)
+
+   .. versionadded:: 3.2
+
+
 .. function:: isinf(x)
 
-   Check if the float *x* is positive or negative infinity.
+   Return ``True`` if *x* is a positive or negative infinity, and
+   ``False`` otherwise.
 
 
 .. function:: isnan(x)
 
-   Check if the float *x* is a NaN (not a number).  For more information
-   on NaNs, see the IEEE 754 standards.
+   Return ``True`` if *x* is a NaN (not a number), and ``False`` otherwise.
 
 
 .. function:: ldexp(x, i)
@@ -146,6 +154,22 @@ Power and logarithmic functions
    Return ``e**x``.
 
 
+.. function:: expm1(x)
+
+   Return ``e**x - 1``.  For small floats *x*, the subtraction in
+   ``exp(x) - 1`` can result in a significant loss of precision; the
+   :func:`expm1` function provides a way to compute this quantity to
+   full precision::
+
+      >>> from math import exp, expm1
+      >>> exp(1e-5) - 1  # gives result accurate to 11 places
+      1.0000050000069649e-05
+      >>> expm1(1e-5)    # result accurate to full precision
+      1.0000050000166668e-05
+
+   .. versionadded:: 3.2
+
+
 .. function:: log(x[, base])
 
    With one argument, return the natural logarithm of *x* (to base *e*).
@@ -276,6 +300,38 @@ Hyperbolic functions
    Return the hyperbolic tangent of *x*.
 
 
+Special functions
+-----------------
+
+.. function:: erf(x)
+
+   Return the error function at *x*.
+
+   .. versionadded:: 3.2
+
+
+.. function:: erfc(x)
+
+   Return the complementary error function at *x*.
+
+   .. versionadded:: 3.2
+
+
+.. function:: gamma(x)
+
+   Return the Gamma function at *x*.
+
+   .. versionadded:: 3.2
+
+
+.. function:: lgamma(x)
+
+   Return the natural logarithm of the absolute value of the Gamma
+   function at *x*.
+
+   .. versionadded:: 3.2
+
+
 Constants
 ---------