Pure Logic.- A Note on Partial Postulate Sets for Propositional Logic.- Provability in Logic.- The Morning Star Paradox.- A Note on Quantification and Modalities.- On the Characterization of Modalities.- A Simplified Proof Method for Elementary Logic.- Equivalent Theories.- An Algebraic Logic Calculus.- Equational Calculi and Automatic Demonstration.- Entailment.- The Paradox of the Unexpected Hanging, Regained Again.- Applied Logic: Obligations, Rights And Action.- New Foundations for Ethical Theory.- Rights and Parliamentarism.- Law and Logic.- Some Aspects on the Concept of Influence.- On Realization of Human Rights.- Unavoidability.- Unavoidability. Appendix.- Applied Logic: Preference And Choice.- Preference Logic.- A Note on Preference-Logic.- Choice and Modality.- Choice Based on Preference.- Decision by Democratic Procedure.- Philosophy Of Science.- Measurement: An Essay in Philosophy of Science.- The Notion of a Phoneme.- Published Writings of Stig Kanger.- Index of Names.