HI, 

I am using the series function on KummerU (Kummer function of the second kind). 

I found that series(KummerU(p,1/2,t),t) works as below, but series(KummerU(p,1/2,t),p) gives me the following error "Error in (series/fracpower) unable to compute series". 

Any idea what that is the case 

Thanks