Infinite regress
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An infinite regress in a series of propositions arises if the truth of proposition P_{1} requires the support of proposition P_{2}, and for any proposition in the series P_{n}, the truth of P_{n} requires the support of the truth of P_{n+1}. There would never be adequate support for P_{1}, because the infinite sequence needed to provide such support could not be completed.
Distinction is made between infinite regresses that are "vicious" and those that are not. One definition given is that a vicious regress is "an attempt to solve a problem which re-introduced the same problem in the proposed solution. If one continues along the same lines, the initial problem will recur infinitely and will never be solved. Not all regresses, however, are vicious."