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Problem with Syntax in Mathematica Summation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg84409] Problem with Syntax in Mathematica Summation
  • From: Manuel Salazar <msalazardc at yahoo.com>
  • Date: Fri, 21 Dec 2007 20:41:52 -0500 (EST)

I have a complex summation equation that I'm trying to simplify. However, I keep getting a number of error messages that I can't figure out.
the formula is as follows:

wacc = ((rf +\[Beta] ((1 + tax) (d/(d + e))) (rf - rm)) (e/(d + 
        e))) ((rf + (1 - (NormalPValue[(Log[(d/(d + e))]/((d/(d + 
                  e)) - 1)) (1/stde)])) r) (d/(d + e)))
value = \!\(
UnderoverscriptBox[\(\(\ \)\(\[Sum]\)\), \(t = 1\), \(\[Infinity]\)] 
\*FractionBox[\((ebitda \\_ t\ \((1 - tax)\))\), \(\((1 + wacc)\)^
     t\)]\) + \!\(
\*UnderoverscriptBox[\(\[Sum]\), \(t = 1\), \(\[Infinity]\)]
\*FractionBox[\(\((dep \\_ t)\)\ tax\), \(\((1 + wacc)\)^
     t\)]\) - \!\(
\*UnderoverscriptBox[\(\[Sum]\), \(t = 1\), \(n\)]
\*FractionBox[\(\((d \\_ 0 - 
\*UnderoverscriptBox[\(\[Sum]\), \(t = 
          1\), \(n\)]d \\_ \((t - 1)\))\) \((rf + 
       1 - \((NormalPValue[\((
\*FractionBox[\(Log[\((d/\((d + e)\))\)]\), \(\((d/\((d + e)\))\) - 
             1\)])\) \((
\*FractionBox[\(1\), \(stde\)])\)])\))\) 
     r \((1 - tax)\)\), \(\((1 + wacc)\)^t\)]\) - \!\(
\*UnderoverscriptBox[\(\[Sum]\), \(t = 1\), \(n\)]
\*FractionBox[\(d \\_ 0/n\), \(\((1 + wacc)\)^t\)]\) - kinv \_ 0

and I get the following error messages:

Syntax::sntxb: Expression cannot begin with "[ebitda \_t](1-tax)".
Syntax::sntxi: Incomplete expression; more input is needed.

I need help with this errors to be able to simplify this formula.


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