MathGroup Archive 2009

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Output of TraditionalForm for Exp

  • To: mathgroup at smc.vnet.net
  • Subject: [mg103297] Re: [mg103290] Output of TraditionalForm for Exp
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Mon, 14 Sep 2009 07:10:16 -0400 (EDT)
  • Reply-to: hanlonr at cox.net

I get a different (simpler) result.

$Version

7.0 for Mac OS X x86 (64-bit) (February 19, 2009)

eqn = 1/a^2 D[T[t], t] + b D[T[t], t] + c^2 T[t] == 0;

soln = T[t] /. DSolve[eqn, T[t], t][[1]]

C[1]/E^((a^2*c^2*t)/(a^2*b + 1))

eqn /. NestList[D[#, t] &, T[t] -> soln, 1] // Simplify

True

Recommend that you start with a clean kernel.


Bob Hanlon

---- fizzy <fizzycist at knology.net> wrote: 

=============
Diff Eqn:    1/a^2 D[T[t],t] + b D[T[t],t] + c^2 T[t] == 0

Solution to this gives the following in TraditionalForm =
output:....V7.01....

C1 Exp[1/2 t  (a^2 (-b) - a Sqrt[a^2 b^2 -4 c^2])] + C2  e^(1/2 t  (Sqrt[a^2 b^2 -4 c^2] - a^2 b)]) .....

where the second part, i.e. e^( )...the exponent part, ( ) , is actuallly on the same line as the ^ as it would be if I used the power exponent from the Basic Math pallette.....


Q:....why this difference in output??....why arent both 'e' raised to the power of, etc??...

I realize I can fix this with a rule and HoldForm but why doesnt TradForm use only one of the output forms especially in the same output?

thanks....jerry blimbaum



  • Prev by Date: Integrate on StudentTDistribution
  • Next by Date: Re: Output of TraditionalForm for Exp
  • Previous by thread: Re: Re: Output of TraditionalForm for Exp
  • Next by thread: Re: Output of TraditionalForm for Exp