[1] A. V. Arhangel'skii:
The frequency spectrum of a topological space and the classification of spaces. Soviet Math. Dokl. 13 (1972) 265-268.
MR 0394575
[2] A. V. Arhangel'skii: The frequency spectrum of a topological space and the product operation. Trans. Moscow Math. Soc. (1981) 163-200.
[4] R. Frič, P. Vojtáš:
Diagonal conditions in sequential convergence. Proc. Conf. on Convergence, Bechyně, 1984. Akademie-Verlag Berlin 1985.
MR 0835474
[6] G. Gruenhage:
A note on the product of Fréchet spaces. Topology Proc. 3 (1978) 109-115.
MR 0540482
[7] V. I. Malyhin:
On countable space having no bicompactification of countable tightness. Soviet Math. Dokl. 13 (1972) 1407-1411.
MR 0320981
[11] T. Nogura: Products of $\langle \alpha_i \rangle$-spaces. Topology Appl. 21 (1985) 251-259.
[14] P. Simon:
A compact Fréchet space whose square is not Fréchet. Comment. Math. Univ. Carolinae 21 (1980) 749-753.
MR 0597764 |
Zbl 0466.54022