Author

Carlos M. Da Fonseca

Kuwait College of Science and Technology, Doha District, Safat, 13133, Kuwait

ORCID 0000-0001-7742-4416

Published papers: 2
Citations: 2
Views: 357
Downloads: 46

Publications

2 papers

Open Access Research Article·pp. 2179–2188·Vol. 29, Issue 6Jun 2026

Some remarks on the index of a broom and equitable partitions

Carlos M. Da Fonseca, Paulo Saraiva, Fatih Yılmaz

Published Online: 27 Mar 2026DOI: 10.47974/JDMSC-2347

In this paper: In this paper, we present an alternative and short proof for the expression of the index of a broom, based on equitable partitions and perturbed Toeplitz tridiagonal matrices. A similar general result...

Abstract References Full Text PDF (545 KB)Views: 221Downloads: 39Citations: 0

Open Access Research Article·pp. 1573–1580·Vol. 28, Issue 4Jun 2025

Telephone numbers extensions

Carlos M. Da Fonseca, Anthony G. Shannon

Published Online: 12 Jun 2025DOI: 10.47974/JIM-2148

In this paper: In this note we bring together in one place the recent extensions of telephone numbers using determinants from certain matrices. A common formula involving Hermite and relevant recurrence relations ar...

Abstract References Full Text PDF (182 KB)Views: 136Downloads: 7Citations: 2