TY - JOUR TI - CJM volume 77 issue 2 Cover and Front matter JO - Canadian journal of mathematics PY - 2025 SP - f1 EP - f3 VL - 77 IS - 2 UR - http://geodesic.mathdoc.fr/articles/10.4153/S0008414X2500015X/ DO - 10.4153/S0008414X2500015X ID - 10_4153_S0008414X2500015X ER -