This is the twenty-third in a series of workshops intended to foster interdisciplinary research in pure and applied logic. The invited speakers are: P. BarcelA≥, D. BartosovA° (to be confirmed), J.A. Makowsky, A. Palmigiano, S. Smets, K. Tent (to be confirmed), and A. Villaveces. The Chair of the Program Committee is J. VA§A§nA§men. The Co-chairs of the (Local) Organizing Committee are C. Zepeda CortA©s, A.G. de Oliveira, M. Osorio, and R. de Queiroz.