a,E0,R,c,t = var('a,E0,R,c,t')      #Declaring all as a variable
assume(a>0)                     #We need to specify that a is non-negative
I_t = E0/R + c*exp(-a*t)       #Equation for I_t
limit(I_t,t=Infinity)

SageDays/Kreyszig-1.7-1-1 (last edited 2010-08-09 14:04:57 by hector1618)