Office of Special Investigations | Philosophical Investigations | CNN Special Investigations Unit | United States House Foreign Affairs Subcommittee on Oversight and Investigations | United States House Energy Subcommittee on Oversight and Investigations | The Deacon's Masterpiece or, the Wonderful "One-hoss Shay": A Logical Story | Tax deduction | Psycho+Logical-Records | Private Investigations | Office of Special Investigations (United States Department of Justice) | National Investigations Committee on Aerial Phenomena | Logical volume management | Logical positivism | logical positivism | Logical partition | Logical matrix | Logical constant | Logical block addressing | Investigations Police of Chile | Half Moon Investigations (TV series) | Above-the-line deduction |
Investigations into Logical Deduction (Untersuchungen über das logische Schließen) 1934/5 works by Gerhard Gentzen