New Issue Released We are pleased to deliver you the latest issue of Journal of Discrete Mathematics and Its Applications (Volume 9, Issue 2, Spring 2024), is online now. Further information is available in website: https://jdma.sru.ac.ir/ Please click on the links to view each article. 1. On an interesting hypothesis of the theory of formal languages Boris Melnikov View Article | Full Text 2. On the two-sided group digraph with a normal adjacency matrix Farzaneh Nowroozi Larki; Shahram Rayat Pisheh View Article | Full Text 3. Exploring the watching system of polyhedral graphs Sheyda Maddah View Article | Full Text 4. Orbit entropy versus the symmetry index Matthias Dehmer; Maryam Jalali-Rad View Article | Full Text 5. A survey on automorphism groups and transmission-based graph invariants Reza Sharafdini; Mehdi Azadimotlagh View Article | Full Text 6. Golden ratio in graph theory: a survey Saeid Alikhani; Nima Ghanbari View Article | Full Text