%0 Journal Article %A Macdonald, Gordon W. %T Distance From Projections to Nilpotents %J Canadian journal of mathematics %D 1995 %P 841-851 %V 47 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1995-043-3/ %R 10.4153/CJM-1995-043-3 %F 10_4153_CJM_1995_043_3