negative conclusion
21False dilemma — A false dilemma (also called false dichotomy, the either or fallacy, fallacy of false choice, black and white thinking, or the fallacy of exhaustive hypotheses) is a type of logical fallacy that involves a situation in which only two alternatives …
22Plato: metaphysics and epistemology — Robert Heinaman METAPHYSICS The Theory of Forms Generality is the problematic feature of the world that led to the development of Plato’s Theory of Forms and the epistemological views associated with it.1 This pervasive fact of generality appears …
23Affirming the consequent — Affirming the consequent, sometimes called converse error, is a formal fallacy, committed by reasoning in the form: If P, then Q. Q. Therefore, P. An argument of this form is invalid, i.e., the conclusion can be false even when statements 1 and 2 …
24Ambiguity — Sir John Tenniel s illustration of the Caterpillar for Lewis Carroll s Alice s Adventures in Wonderland is noted for its ambiguous central figure, whose head can be viewed as being a human male s face with a pointed nose and pointy chin or being… …
25Masked man fallacy — The masked man fallacy is a fallacy of formal logic in which substitution of identical designators[clarification needed] in a true statement can lead to a false one. One form of the fallacy may be summarized as follows: Premise 1: I know who X is …
26Leibniz: truth, knowledge and metaphysics — Nicholas Jolley Leibniz is in important respects the exception among the great philosophers of the seventeenth century. The major thinkers of the period characteristically proclaim the need to reject the philosophical tradition; in their… …
27Naturalistic fallacy — The naturalistic fallacy is often claimed to be a formal fallacy. It was described and named by British philosopher G. E. Moore in his 1903 book Principia Ethica. Moore stated that a naturalistic fallacy is committed whenever a philosopher… …
28Arrow's impossibility theorem — In social choice theory, Arrow’s impossibility theorem, the General Possibility Theorem, or Arrow’s paradox, states that, when voters have three or more distinct alternatives (options), no voting system can convert the ranked preferences of… …
29Denying the antecedent — Denying the antecedent, sometimes also called inverse error, is a formal fallacy, committed by reasoning in the form: If P, then Q. Not P. Therefore, not Q. Arguments of this form are invalid. Informally, this means that arguments of this form do …
30Observer-expectancy effect — Participant observer effect redirects here. Psychology …
