"forall x: Calgary — An Introduction to Formal Logic" is a textbook authored by Roberts, focusing on the subject of logic. With 405 pages, this advanced-level book provides a comprehensive exploration of formal logic in a clear and accessible format. Published in 2025, this paperback edition serves as an essential resource for those looking to deepen their understanding of logic principles and foundations. The use of English language ensures widespread accessibility and understanding for readers interested in delving into the world of formal logic.