Add Root Function and Product Function

MathKit/MPProductFunctionTerm.h

@@ -0,0 +1,37 @@
+//
+//  MPProductFunctionTerm.h
+//  MathPad
+//
+//  Created by Kim Wittenburg on 10.01.15.
+//  Copyright (c) 2015 Kim Wittenburg. All rights reserved.
+//
+
+#import "MPFunctionTerm.h"
+
+/*!
+ @header
+ This file contains the <code>MPProductFunctionTerm</code> class.
+ */
+
+
+
+@class MPProductFunctionTerm;
+
+
+/*!
+    @class      MPProductFunctionTerm
+    @abstract   Represents and evaluates a <code>@link
+                //apple_ref/occ/cl/MPProductFunction@/link</code>.
+ 
+    @discussion A product function evaluates its sum term <code>n</code> times.
+                How often it actually is evaluated depends on the boundary
+                expressions (start and target). Both are inclusive.
+ 
+                A product function also features a variable that contains the
+                current value of the iteration. The variable is defined in the
+                start expression and incremented by <code>1</code> after every
+                iteration.
+ */
+@interface MPProductFunctionTerm : MPFunctionTerm
+
+@end