Content of CMUC 21 (1980), No.2

Bureš J., Vanžura J.
A Nijenhuis-type tensor on the quotient of a distribution. Comment.Math.Univ.Carolinae 21(1980) 201--208.
Bican L.
Purely finitely generated Abelian groups. Comment.Math.Univ.Carolinae 21(1980) 209--218.
Vinárek J.
Representations of countable commutative semigroups by products of weakly homogeneous spaces. Comment.Math.Univ.Carolinae 21(1980) 219--229.
Haslinger J., Lovíšek J.
Mixed variational formulation of unilateral problems. Comment.Math.Univ.Carolinae 21(1980) 231--246.
Pytkeev E.G., Yakovlev N.N.
On bicompacta which are unions of spaces defined by means of coverings. Comment.Math.Univ.Carolinae 21(1980) 247--261.
Yakovlev N.N.
On bicompacta in $\Sigma $-products and related spaces. Comment.Math.Univ.Carolinae 21(1980) 263--283.
Gardner B.J.
Extension-closure and attainability for varieties of algebras with involution. Comment.Math.Univ.Carolinae 21(1980) 285--292.
Jirásková H.
Generalized flatness and coherence. Comment.Math.Univ.Carolinae 21(1980) 293--308.
Kolář I.
On the automorphisms of principal fibre bundles. Comment.Math.Univ.Carolinae 21(1980) 309--312.
Lee S.-M.
On a simple one-element extension of left zero semigroups. Comment.Math.Univ.Carolinae 21(1980) 313--318.
Meister H.
Zum Fixpunktverhalten nichtexpansiver Abbildungen. Comment.Math.Univ.Carolinae 21(1980) 319--331.
Dostál Z.
A note on estimate of the spectral radius of symmetric matrices. Comment.Math.Univ.Carolinae 21(1980) 333--340.
Kepka T., Němec P.
Trilinear constructions of quasimodules. Comment.Math.Univ.Carolinae 21(1980) 341--354.
Kepka T.
Commutative Moufang loops and distributive Steiner quasigroups nilpotent of class $3$. Comment.Math.Univ.Carolinae 21(1980) 355--370.
Glastad B., Hopkins G.
Commutative semigroup rings which are principal ideal rings. Comment.Math.Univ.Carolinae 21(1980) 371--377.
Čerych J.
A characterization of $C(X)$. Comment.Math.Univ.Carolinae 21(1980) 379--383.
Dvurečenskij A., Riečan B.
On the individual ergodic theorem on a logic. Comment.Math.Univ.Carolinae 21(1980) 385--391.
Jackett D.R.
The nil-degree of a torsion-free Abelian group. Comment.Math.Univ.Carolinae 21(1980) 393--406.