Yacas lacks the symbolic multiplication functionality. It should work like the existing symbolic summation functionality. For example:
Sum(x,1,n,x) sums 1+2+3+4+...+n and produces n(n+1)/2.
New function with the same input as above should calculate 1234...*n and produce n!.
Another example:
New function should calculate 2 2 2...2 as 2^n
Yacas lacks the symbolic multiplication functionality. It should work like the existing symbolic summation functionality. For example: Sum(x,1,n,x) sums 1+2+3+4+...+n and produces n(n+1)/2. New function with the same input as above should calculate 1234...*n and produce n!.
Another example: New function should calculate 2 2 2...2 as 2^n