(economics) The observation that the rate of interest and the general level of prices are positively correlated.

(philosophy) Any of a set of philosophical problems generally thought to have been devised by the Greek philosopher Zeno of Elea (c. 490–430 BC) to support Parmenides' doctrine that, contrary to the evidence of one's senses, the belief in plurality and change is mistaken, and in particular that motion is nothing but an illusion.

plural of Zeno's paradox

plural of paradox of fiction

(set theory) A demonstration of a surprising property of infinite sets. Some positive integers are squares while others are not; therefore, all the numbers, including both squares and non-squares, must be more numerous than just the squares; yet for every square there is exactly one positive number that is its square root, and for every number there is exactly one square; hence, there cannot be more of one than of the other.

The observation that at the species level, the incidence of cancer does not appear to correlate with the number of cells in an organism.

(fluid dynamics) The contradiction that, for incompressible and inviscid potential flow, the drag force is zero on a body moving with constant velocity relative to the fluid.

The linguistic paradox that, if there are unnameable things, their existence cannot be indicated without naming them in some way.

plural of Klein paradox

(physics) The black hole information paradox.