TY  - JOUR
AU  - V. I. Ponomarev
AU  - V. V. Tkachuk
TI  - The countable character of $X$ in $\beta X$ versus the countable character of the diagonal in $X\times X$
JO  - Vestnik Moskovskogo universiteta. Matematika, mehanika
PY  - 1987
SP  - 16
EP  - 19
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/VMUMM_1987_5_a3/
LA  - ru
ID  - VMUMM_1987_5_a3
ER  -