Maxima Function
var_exp (m)
Returns the variance of an Exponential(m) random variable, with m>0.
The Exponential(m) random variable is equivalent to the Weibull(1,1/m), therefore when Maxima has not enough information to get the result, a noun form based on the Weibull variance is returned.
(%i1) load (distrib)$ (%i2) var_exp(m); 1 (%o2) var_weibull(1, -) m (%i3) assume(m>0)$ var_exp(m); 1 (%o4) -- 2 m