Contributions to Mathematics (ISSN : 2709-3646)

Volume 4 (2021)

Comparing Degree–Based Energies of Trees
Ivan Gutman
Pages: 1-5  |  DOI: 10.47443/cm.2021.0030

Some New Integral Inequalities via General Forms of Proportional Fractional Integral Operators
Saad Ihsan Butt, Ahmet Ocak Akdemir, Sinan Aslan, İmdat İscan, Praveen Agarwal
Pages: 6–11  |  DOI: 10.47443/cm.2021.0027

An Alternative Proof of a Harmonic Mean Inequality for Nielsen’s Beta Function
Kwara Nantomah
Pages: 12–13  |  DOI: 10.47443/cm.2021.0028

Fuzzy Implications Based on Strong Negations
Anestis G. Hatzimichailidis, Georgios Souliotis, Basil Papadopoulos
Pages: 14–19  |  DOI: 10.47443/cm.2021.0040

The Clique Number and Some Hamiltonian Properties of Graphs
Rao Li
Page: 20–22  |  DOI: 10.47443/cm.2021.0038

Estimates for the Ratio of the First Two Eigenvalues of the Dirichlet-Laplace Operator with a Drift
Şerban Bărbuleanu, Mihai Mihăilescu, Denisa Stancu-Dumitru
Pages: 23–27  |  DOI: 10.47443/cm.2021.0043

Harary-Albertson Index of Graphs
Zhen Lin
Pages: 28–34  |  DOI: 10.47443/cm.2021.0051

Weakly Irreducible Filter in Strong Quasi-Ordered Residuated Systems
Daniel A. Romano
Pages: 35–40  |  DOI: 10.47443/cm.2021.0032

Relating Energy and Sombor Energy
Ivan Gutman, Izudin Redžepović, Juan Rada
Pages: 41–44  |  DOI: 10.47443/cm.2021.0054