The book includes several essays written by prominent contemporary philosophers as well as by younger researchers in honor of Mario Alai on the occasion of his 70th birthday. The single original contributions delve into different foundational issues in the philosophy of science, epistemology, philosophy of language, and metaphysics, and engage in rigorous analyses of the structure and workings of different forms of human knowledge. This fruitful variety of perspectives reflects the wide-ranging and multifaceted character of Mario Alai's philosophical work and interests. The book also includes an extensive reply written by Alai himself, which amply testifies to his lifelong commitment to passionate yet fair-minded philosophical debate.

Adriano Angelucci, Ph.D. Student, University of Urbino Carlo Bo.

Vincenzo Fano, Full Professor of Logic and Philosophy of Science, University of Urbino Carlo Bo.

Gabriele Ferretti, Humboldt Fellow, Ruhr-University Bochum.

Giovanni Galli, Ph.D. Student, University of Urbino Carlo Bo.

Pierluigi Graziani, Assistant Professor of Logic and Philosophy of Science, University of Urbino Carlo Bo.

Gino Tarozzi, Full Professor of Logic and Philosophy of Science, University of Urbino Carlo Bo.