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In the report by M. Singer (USA) read at Moscc)w University in October 1989 the following problem 'was formulated: for differential operator D = Pa ~z + Q a% to find such integer Ii, that any irreducible polynomial ~ dividing D$ has degree deg ~ < 1{. This problem arises when we want to find the symbolic solution of a differential equation ~ = R(z, y) where… (More)

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