============================================================== Friendliness for Logicians David Makinson King's College, London We define and examine a notion of logical friendliness, which is a natural broadening of the familiar notion of classical consequence. It is formulated first in its simplest form, and then in a syntax-independent version, which we call sympathy. Although born of idle curiosity, the concept makes contact with a surprising range of notions and operations familiar in the history of logic from 1847 to the present. ============================================================== Brief Biodata: David (Clement) Makinson received his B.A. (First class honours) from Sydney University in 1961, and D.Phil. from Oxford University in 1965. During 1965-1980 he was Professor at the American University of Beirut, Lebanon. During 1980-2001 he was Programme Specialist in the Division of Social Science Research and Policy (SHS/SRP), Sector of Social and Human Sciences, UNESCO, Paris. During this period he was also the Editor-in-Chief of UNESCO's International Social Science Journal. Currently he is a Senior Research Fellow in Unit of Logic Language and Computation, Department of Computer Science, King's College London. David Makinson (along with Peter Gardenfors and Carlos Alchourron) is one of the three founding fathers of the area of Theory Change (known as the AGM system). His current research areas include nonmonotonic logics, input/output logics, logic of norms, and logic of belief change. Author of two books in logic ("Topics in modern logic", Methuen, 1973 - in three languages - and "Bridges From Classical To Nonmonotonic Logic", King's College Publications, 2005), he has published over fifty frequently cited papers that appeared in leading international journals including J. Artificial Intelligence, J. Logic and Computation, Logic Journal of the IGPL, J. Logic, Language and Information, J. Philosophical Logic, Studia Logica, J. Symbolic Logic, Zeitschrift Math. Logik and Theoria. Webpage: http//www.dcs.kcl.ac.uk/staff/makinson/