Added Documentation

MathKit/MPFactorialTerm.h

@@ -13,10 +13,35 @@
 @class MPFactorialTerm;
 
 
+/*!
+    @class      MPFactorialTerm
+    @abstract   A factorial term implements the factorial function.
+ 
+    @discussion Because the factorial function is only defined for whole numbers,
+                actually the gamma function is used. The gamma function is
+                defined for all real numbers.
+ */
 @interface MPFactorialTerm : MPTerm
 
+/*!
+    @method     initWithTerm:
+    @abstract   Initializes the receiver with the specified term.
+ 
+    @discussion The <code>term</code> is not copied.
+ 
+    @param      term
+                The term to initialize the receiver. Must not be
+                <code>nil</code>.
+ 
+    @return     A newly initialized factorial term.
+ */
 - (instancetype)initWithTerm:(MPTerm *)term; /* designated initializer */
 
+
+/*!
+    @property   term
+    @abstract   The receiver's term.
+ */
 @property (readonly, nonatomic, strong) MPTerm *term;
 
 @end