TY - JOUR TI - CJM volume 77 issue 4 Cover and Back matter JO - Canadian journal of mathematics PY - 2025 SP - b1 EP - b2 VL - 77 IS - 4 UR - http://geodesic.mathdoc.fr/articles/10.4153/S0008414X25101144/ DO - 10.4153/S0008414X25101144 ID - 10_4153_S0008414X25101144 ER -