%0 Journal Article %T CJM volume 75 issue 4 Cover and Back matter %J Canadian journal of mathematics %D 2023 %P b1-b2 %V 75 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/S0008414X23000445/ %R 10.4153/S0008414X23000445 %F 10_4153_S0008414X23000445