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2012-04-20 00:39:03 +0200 asked a question Problems with LaPlace transform when 'a' is negative in e^-at
var('s t')
f = t^(-1)*exp(-t)-t^(-1)*exp((-3)*t)

The above transform works as expected, however, when (-3) is changed to (3), I get the following error:

Traceback (click to the left of this block for traceback)
TypeError: ECL says: Maxima asks: Is  s-3  positive, negative, or zero?

The Solution that I am expecting is:

log((s - 3)/(s + 1))

I don't know how to specify if s-3 is positive, negative, or zero. Any ideas?

Thanks, Taylor Killian