Dag Westerståhl is professor emeritus of theoretical philosophy and logic at Stockholm University. His recent research is in the area of generalized quantifiers, formal semantics, and the philosophy of logic.
"""The most attractively written book at its level that I have newly encountered for some years. . . . The expositional choices are very well-judged, and the balance between motivational chat and worked-through formal details seems just right to me. Many student readers should find this book quite excellent for self-study."" * Logic Matters *"