TY - JOUR AU - A. I. Shtern TI - Criterion for the extendability of a~unitary character on a~normal subgroup of a~product group to a~pure one-dimensional pseudorepresentation of the group JO - Fundamentalʹnaâ i prikladnaâ matematika PY - 2024 SP - 251 EP - 254 VL - 25 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/FPM_2024_25_1_a14/ LA - ru ID - FPM_2024_25_1_a14 ER -