A Note on Lipshitz's Lemma 3
  In this note, we give a remark on the proof of Lemma 3 in Lipshitz's paper "The diagonal of a D-Finite power series is D-Finite". This remark is motivated by the observation that the statement from line -8 to -3 on page 375 of that paper seems not completely correct. 
Shaoshi Chen and Ziming Li
math.RA math.AC