Correction to Low and Lapsley's article "Optimization Flow Control, I:   Basic Algorithm and Convergence"
  In the note an error in Low and Lapsley's article ("Optimization Flow Control, I: Basic Algorithm and Convergence", IEEE/ACM Transactions on Networking, 7(6), pp. 861-874, 1999) is pointed out. Because of this error the proof of the Theorem 2 presented in the article is incomplete and some assessments are wrong. In the second part of the note the author proposes a correction to this proof. 
Andrzej Karbowski