add headings

Doc/library/math.rst

@@ -21,8 +21,9 @@ was generated in the first place.
 The following functions are provided by this module.  Except when explicitly
 noted otherwise, all return values are floats.
 
-Number-theoretic and representation functions:
 
+Number-theoretic and representation functions
+---------------------------------------------
 
 .. function:: ceil(x)
 
@@ -146,7 +147,9 @@ Python floats typically carry no more than 53 bits of precision (the same as the
 platform C double type), in which case any float *x* with ``abs(x) >= 2**52``
 necessarily has no fractional bits.
 
-Power and logarithmic functions:
+
+Power and logarithmic functions
+-------------------------------
 
 .. function:: exp(x)
 
@@ -193,7 +196,8 @@ Power and logarithmic functions:
    Return the square root of *x*.
 
 
-Trigonometric functions:
+Trigonometric functions
+-----------------------
 
 .. function:: acos(x)
 
@@ -241,7 +245,8 @@ Trigonometric functions:
    Return the tangent of *x* radians.
 
 
-Angular conversion:
+Angular conversion
+------------------
 
 .. function:: degrees(x)
 
@@ -253,7 +258,8 @@ Angular conversion:
    Converts angle *x* from degrees to radians.
 
 
-Hyperbolic functions:
+Hyperbolic functions
+--------------------
 
 .. function:: acosh(x)
 
@@ -291,7 +297,8 @@ Hyperbolic functions:
    Return the hyperbolic tangent of *x*.
 
 
-The module also defines two mathematical constants:
+Constants
+---------
 
 .. data:: pi