A sketch of logic without truth

1. Jøgensen's Dilemma - 2. The Proposed Solution - 3. Short History of a Philosophical Prejudice - 4. The Abstract, Syntactical and Semantic Notion of Consequence - 4.1. The Abstract Notion of Consequence - 4.2. The Syntactical Notion of Consequence - 4.3. The Semantic Notion of Consequence - 4.4. The Meaning Given by Rules of Use in a Context - 4.5. Which Operators does Logic Require? - 5. Deontic Logic - 6. The Consequences for Computer Scientists.