hold -- hold something in a holder expression

• Usage:

  hold x

• Inputs:
  • x
• Outputs:
  • an expression, of class Holder containing x as its single element, unless x is already an expression, in which case x is returned.

i1 : (hold 2)^5 * (hold 3)^3

      5 3
o1 = 2 3

o1 : Expression of class Product