liar paradox - meaning and definition. What is liar paradox
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What (who) is liar paradox - definition

STATEMENT OF A LIAR WHO STATES THAT THEY ARE LYING: FOR INSTANCE, DECLARING THAT "I AM LYING" OR "EVERYTHING I SAY IS FALSE"
Liar's paradox; Liar Paradox; Eubulides' paradox; This statement is false; This sentence is false; I am lying; Liar's Paradox; Lair Paradox; Pseudomenon; Liar logic; Liar Logic; The liar paradox; Epimenides sentence; Liar's parado; Liar’s paradox; Eublides paradox; Antinomy of the liar

liar paradox         
<philosophy> A sentence which asserts its own falsity, e.g. "This sentence is false" or "I am lying". These paradoxical assertions are meaningless in the sense that there is nothing in the world which could serve to either support or refute them. Philosophers, of course, have a great deal more to say on the subject. ["The Liar: an Essay on Truth and Circularity", Jon Barwise and John Etchemendy, Oxford University Press (1987). ISBN 0-19-505944-1 (PBK), Library of Congress BC199.P2B37]. (1995-02-22)
Liar paradox         
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.
D'Alembert's paradox         
  • Jean le Rond d'Alembert (1717-1783)
  • Steady and separated incompressible potential flow around a plate in two dimensions,<ref>Batchelor (2000), p. 499, eq. (6.13.12).</ref> with a constant pressure along the two free streamlines separating from the plate edges.
  • wake]],<br>
•5: post-critical separated flow, with a turbulent boundary layer.
  • Pressure distribution for the flow around a circular cylinder. The dashed blue line is the pressure distribution according to [[potential flow]] theory, resulting in d'Alembert's paradox. The solid blue line is the mean pressure distribution as found in experiments at high [[Reynolds number]]s. The pressure is the radial distance from the cylinder surface; a positive pressure (overpressure) is inside the cylinder, towards the centre, while a negative pressure (underpressure) is drawn outside the cylinder.
  • circular]] cylinder in a uniform onflow.
THE THEOREM THAT, FOR INCOMPRESSIBLE AND INVISCID POTENTIAL FLOW, THE DRAG FORCE IS 0 ON A BODY MOVING WITH CONSTANT VELOCITY RELATIVE TO THE FLUID, IN CONTRADICTION TO REAL LIFE, WHERE VISCOSITY CAUSES SUBSTANTIAL DRAG, ESPECIALLY AT HIGH VELOCITIES
D'Alembert's Paradox; D'Alembert paradox; Hydrodynamic paradox; D'Alembert Paradox; D'Alemberts Paradox; D'Alemberts' Paradox; Dalembert's Paradox; Hydrodynamical paradox; Hydrodynamics paradox; D'alembert's Paradox
In fluid dynamics, d'Alembert's paradox (or the hydrodynamic paradox) is a contradiction reached in 1752 by French mathematician Jean le Rond d'Alembert.Jean le Rond d'Alembert (1752).

Wikipedia

Liar paradox

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. In "this sentence is a lie" the paradox is strengthened in order to make it amenable to more rigorous logical analysis. It is still generally called the "liar paradox" although abstraction is made precisely from the liar making the statement. Trying to assign to this statement, the strengthened liar, a classical binary truth value leads to a contradiction.

If "this sentence is false" is true, then it is false, but the sentence states that it is false, and if it is false, then it must be true, and so on.