||'''Book'''|| Advanced Engineering Mathematics ||
 ||'''Author'''|| Erwin Kreyszig ||
 ||'''Edition'''|| 8th Edition ||

/* code_begins */

{{{
t = var('t')    # define a variable t
L,R,I_0 = var('L R I_0')
I = function('I',t)   # define I to be a function of that variable
# L, R, I_0 are constants
DE = L*diff(I,t) + R*I == 0
print 'Differential Equation:'
show(DE)
soln = desolve(DE, [I,t])
print 'Solution:'
show(soln)

c = solve(soln.subs(t=0)==I_0, soln.variables()[2])
show(c)

print 'Explicit solution:'
soln.subs(c=c[0].rhs())
}}}

/* code_ends */

 * '''Solution by''': 
    * Pankaj Pandey, Student, IIT Bombay