Vol. 20 No. 1 (2019): Divulgaciones Matemáticas

The Editorial Board of Divulgaciones Matemáticas is pleased to present the Vol. 20, No. 1, 2019. The articles
contained in this issue are: some received during the second semester of the year 2018, but processed during the first semester of the year 2019; those received during the first semester of the year 2019; and some received during the second semester, wich ones were evaluated and accepted for publication, before the edition of this issue.

It is important to stand out that the present issue of the journal shows articles on each of the section that Divulgaciones Matemáticas present, i.e.: six (6) Research Papers, one (1) Expository and historical Papers, and one manuscripts with the solution of five (5) problems presented in the section of Problems and Solutions and presenting a new problem to solve.

The editorial work related to this issue is the result of the efforts of some members of the Department of Mathematics of the Experimental Faculty of Sciences. The Editors want to express their gratitude to all of those who made this issue possible: to the authors of the presented works, who gave their vote of confidence to the journal; to the referees, who evaluated the articles with selfless work, guaranteeing the quality standards of the journal and significantly improving the way of working; to the editorial team of Divulgaciones Matemáticas; and especially to Professor José Heber Nieto, for his contribution to the Problems and Solutions section. To all of them, thanks a lot.

Finally, the Editorial Board of Divulgaciones Matemáticas ask for apologize to the authors of the articles published here for the inconvenient the delate of the edition of this issues made, we thanks your wait. Furthermore, we invite the Venezuelan and international mathematical community to continue giving their support by submitting their articles to our journal for evaluation and possible publication.