A counterexampleMathworldPlanetmath is an example which is used to prove that a statement is false.

For instance, to disprove that the statement “For all n, 22n+1 is prime.”, one could exhibit 5 as a counterexample; since 225+1=641×6700417, the statement is false.

Title counterexample
Canonical name Counterexample
Date of creation 2013-03-22 14:43:00
Last modified on 2013-03-22 14:43:00
Owner rspuzio (6075)
Last modified by rspuzio (6075)
Numerical id 5
Author rspuzio (6075)
Entry type Definition
Classification msc 00A20