TY - JOUR TI - Editorial JO - Glasgow mathematical journal PY - 2020 SP - S1 EP - S5 VL - 62 IS - S1 UR - http://geodesic.mathdoc.fr/articles/10.1017/S0017089520000518/ DO - 10.1017/S0017089520000518 ID - 10_1017_S0017089520000518 ER -