SA Pichugov - Mathematical notes of the Academy of Sciences of the …, 1988 - Springer
H (X)< hI (x),(4) h (X)= inf {ll z--yll, lI xll= II vii= infll x--Xylt--t}, moreover for some spaces (eg,
X= Li, L2, C) equality holds in (4). There the connection of Jung's constant to the exact …