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Mal'tsev-Neumann products of semi-simple classes of rings
- 摘要：
- Malt'tsev-Neumann products of semi-simple classes of associative rings are studied and some conditio...
- doi：
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10.14712/1213-7243.2023.004
- 作 者：
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Barry James Gardner
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
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On butterfly-points in X , Tychonoff products and weak Lindelöf numbers
- 摘要：
- Let X be the Tychonoff product \prod _{\alpha <\tau}X_{\alpha} of \tau-many Tychonoff non-single poi...
- doi：
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10.14712/1213-7243.2022.023
- 作 者：
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Sergei Logunov
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Commentationes mathematicae Universitatis Carolinae
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On the recognizability of some projective general linear groups by the prime graph
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- Let G be a finite group. The prime graph of G is a simple graph \Gamma(G) whose vertex set is \pi(G)...
- doi：
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10.14712/1213-7243.2023.009
- 作 者：
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Masoumeh Sajjadi
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
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Degree polynomial for vertices in a graph and its behavior under graph operations
- 摘要：
- We introduce a new concept namely the degree polynomial for the vertices of a simple graph. This not...
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10.14712/1213-7243.2023.006
- 作 者：
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Reza Jafarpour-Golza...
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
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Counterexamples to Hedetniemi's conjecture and infinite Boolean lattices
- 摘要：
- We prove that for any c \geq 5, there exists an infinite family (G_n )_{n\in \mathbb{N}} of graphs s...
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10.14712/1213-7243.2023.003
- 作 者：
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Claude Tardif
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
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Some results on derangement polynomials
- 摘要：
- We study moments of the difference D_n(x)-x^n n! {\rm e}^{-1/x} concerning derangement polynomials D...
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10.14712/1213-7243.2022.025
- 作 者：
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Mehdi Hassani ; Hoss...
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
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On FI-mono-retractable modules
- 摘要：
- We introduce the notion of FI-mono-retractable modules which is a generalization of compressible mod...
- doi：
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10.14712/1213-7243.2022.019
- 作 者：
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Marziyeh Atashkar ; ...
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
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Self-small products of abelian groups
- 摘要：
- Let A and B be two abelian groups. The group A is called B-small if the covariant functor {\rm Hom}(...
- doi：
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10.14712/1213-7243.2022.020
- 作 者：
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Josef Dvořák ; Jan Ž...
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
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Hyperplanes in matroids and the axiom of choice
- 摘要：
- We show that in set theory without the axiom of choice ZF, the statement sH: ``Every proper closed s...
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10.14712/1213-7243.2023.010
- 作 者：
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Marianne Morillon
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
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Exponential separability is preserved by some products
- 摘要：
- We show that exponential separability is an inverse invariant of closed maps with countably compact ...
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10.14712/1213-7243.2022.021
- 作 者：
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Vladimir V. Tkachuk
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- 期刊编号：
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
