An n-parameter Chebyshev set which is not a sun. (English) Zbl 0317.41028
MSC:
41A65 | Abstract approximation theory (approximation in normed linear spaces and other abstract spaces) |
41A50 | Best approximation, Chebyshev systems |
41A65 | Abstract approximation theory (approximation in normed linear spaces and other abstract spaces) |
41A50 | Best approximation, Chebyshev systems |