Gamma function

[ftneek]

Nice, simple solution.

It works here:
(((-s)*Gamma((2/3),∞)+s*Gamma((2/3),0))/(s*s^(2/3)))(('Gamma') = Gamma2)
-> s*Gamma((2/3))/((s^(1/3))^2*s)

But not here:
(laplace(t^(-1/3),t,s))(('Gamma') = Gamma2)
-> Bad argument value

I also prefer not to type Gamma=Gamma2 everytime:

Code:

g3:=(ex)->BEGIN  
  ex(('Gamma') = Gamma2);  
END;

Is there an easy way to make the laplace example work using this method?