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Eike Welk committed e4d5ea5

Some doc polishing.

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 N-Ary Addition and Multiplication
 .................................
 
+Addition and multiplication are n-ary, they can have an arbitrary number of 
+arguments. ``1 + a + 2 + 3`` and ``1 * a * 2 * 3`` are respectively 
+expressed as::
+
+    Add(List(Num(1.0), Sym("a"), Num(2.0), Num(3.0)))
+    Mul(List(Num(1.0), Sym("a"), Num(2.0), Num(3.0)))
+    
 There are no nodes for subtraction or division. Subtraction is represented 
 as multiplication with ``-1``: (``-a = -1 * a``). Division is expressed as a 
-power of ``-1``: (``1/a = a~^(-1)``). Addition and multiplication are also 
-*n-ary*, they take an arbitrary number of arguments [#maxima]_. 
+power of ``-1``: (``1/a = a~^(-1)``). [#maxima]_. 
 
 As there are no subtraction or division operators, ``a-x`` and ``a/x`` are 
 respectively expressed as::
     Add(List(Sym("a"), Mul(List(Num(-1.0), Sym("x")))))
     Mul(List(Sym("a"), Pow(Sym("x"), Num(-1.0))))
 
-Addition and multiplication are n-ary, they can have an arbitrary number of 
-arguments. ``1 + a + 2 + 3`` and ``1 * a * 2 * 3`` are respectively 
-expressed as::
-
-    Add(List(Num(1.0), Sym("a"), Num(2.0), Num(3.0)))
-    Mul(List(Num(1.0), Sym("a"), Num(2.0), Num(3.0)))
-    
 Let Expressions
 ................
 
         let (a:=f, a$x:=diff(f, x)) in diff(g, x)
 
 
-.. [#maxima] This idea was taken from the computer algebra program *Maxima*, it is intended 
-       to simplify the algorithms.
+.. [#maxima] The ideas for n-ary operators (additon, multiplication), and 
+   for the ommission of subtraction and division nodes, were taken from the 
+   computer algebra program *Maxima*. It is intended to simplify the 
+   algorithms.