How do I get anything to work with the differential algebra package with(diffalg)? Maple does not recognize its own commands and then makes things worse by crashing my computer. I've had to pull the plug on my computer at least twice. For instance, whenever I try to type "differential_ring" as soon as I type the underscore, Maple puts me into a subscript mode. Also, there seem to be TWO packages of commands for everything: e.g. with(linalg) and with(LinearAlgebra) with(diffalg) and with(DifferentialAlgebra) which overlap tremendously! Also, sometimes [[a,b],[c,d]] is recognized as a matrix and sometimes it is not. Changing it to

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