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The Polish logician Alfred Tarski identified three features of an adequate characterization of entailment: (1) The logical consequence relation relies on the logical form of the sentences: (2) The relation is a priori, i.e., it can be determined with or without regard to empirical evidence (sense experience); and (3) The logical consequence ...
Logical Fallacies, Literacy Education Online; Informal Fallacies, Texas State University page on informal fallacies; Stephen's Guide to the Logical Fallacies (mirror) Visualization: Rhetological Fallacies, Information is Beautiful; Master List of Logical Fallacies, University of Texas at El Paso; Fallacies, Internet Encyclopedia of Philosophy
In philosophy and logic, the classical liar paradox or liar's paradox or antinomy of the liar is the statement of a liar that they are lying: for instance, declaring that "I am lying". If the liar is indeed lying, then the liar is telling the truth, which means the liar just lied.
Hasty generalization is an informal fallacy of faulty generalization, which involves reaching an inductive generalization based on insufficient evidence [3] —essentially making a rushed conclusion without considering all of the variables or enough evidence.
Multi-valued logic – Propositional calculus in which there are more than two truth values; Münchhausen trilemma – Thought experiment used to demonstrate the impossibility of proving any truth; Pluralist theories of truth; Principle of bivalence – Classical logic of two values, either true or false
Lying is the act of knowingly and intentionally or willfully making a false statement. [30] Normal lies are defensive and told to avoid the consequences of truth telling. They are often white lies that spare another's feelings, reflect a pro-social attitude, and make civilized human contact possible. [14]
A blue lie is a form of lying that is told purportedly to benefit a collective or "in the name of the collective good". The origin of the term "blue lie" is possibly from cases where police officers made false statements to protect the police force, or to ensure the success of a legal case against an accused.
A half-truth is a deceptive statement that includes some element of truth.The statement might be partly true, the statement may be totally true, but only part of the whole truth, or it may use some deceptive element, such as improper punctuation, or double meaning, especially if the intent is to deceive, evade, blame or misrepresent the truth.