TY - JOUR TI - CJM volume 75 issue 6 Cover and Back matter JO - Canadian journal of mathematics PY - 2023 SP - b1 EP - b2 VL - 75 IS - 6 UR - http://geodesic.mathdoc.fr/articles/10.4153/S0008414X23000627/ DO - 10.4153/S0008414X23000627 ID - 10_4153_S0008414X23000627 ER -