The paradox is named after the Greek philosopher Zeno of Elea (c. 490–430 BC) and is also known as the “arrow paradox”.

Zeno shows the youth the doors to Truth and Falsity (*Veritas et Falsitas*)

If everything when it occupies an equal space is at rest, and if that which is in locomotion is always occupying such a space at any moment, the flying arrow is therefore motionless.

— Zeno as recounted by Aristotle,PhysicsVI:9, 239b5

In 1977, Baidyanaith Mishra and George Sudarshan demonstrated that an unstable particle will never found to decay when it is continuously observed (cf. observation of the bistable Necker cube).

- Sudarshan, E. C. G.; Misra, B. (1977). “The Zeno’s paradox in quantum theory”.
*Journal of Mathematical Physics*.**18**(4): 756–763.

The Zeno effect is also known as the Touring paradox. Touring formulated the following:

[I]t is easy to show using standard theory that if a system starts in an eigenstate of some observable, and measurements are made of that observableNtimes a second, then, even if the state is not a stationary one, the probability that the system will be in the same state after, say, one second, tends to one asNtends to infinity; that is, that continual observations will prevent motion. Alan and I tackled one or two theoretical physicists with this, and they rather pooh-poohed it by saying that continual observation is not possible. But there is nothing in the standard books (e.g., Dirac’s) to this effect, so that at least the paradox shows up an inadequacy of Quantum Theory as usually presented.— Quoted by Andrew Hodges inMathematical Logic,R. O. Gandy and C. E. M. Yates, eds. (Elsevier, 2001), p. 267.

## Quantum Zeno effect in perception

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