Convexity and non-differentiable singularities in Mortici's paper on Fermat-Torricelli points - Martin Celli We give two proofs of Mortici's result on Fermat-Torricelli points for a class of polygons. ✪ ✪ ✪ ✪ ✪ Link tải tài liệu: LINK TẢI TÀI LIỆU Theo LTTK Education