The paper is devoted to description of two interconnected mistakes generated by the gap in the Du and Hwang approach to Gilbert-Pollack Steiner ratio conjecture.
Cite
@article{arxiv.1402.6079,
title = {Du-Hwang Characteristic Area: Catch-22},
author = {A. O. Ivanov and A. A. Tuzhilin},
journal= {arXiv preprint arXiv:1402.6079},
year = {2014}
}