View source for Certainty, reliability

{{TEX|done}}
A priori conviction of the realization of some event, to the exclusion of any doubt. Certainty is a characterization of the realizability of some event, and is labelled with the highest degree of probability. In probability theory the concept of certainty is connected with certain events (cf. [[Certain event|Certain event]]) and with events occurring with probability one. In practice, one speaks of certainty even when the probability of some event is sufficiently close to one.



====Comments====
[[Reliability theory|Reliability theory]] is the theory studying the probability of correct functioning of a manufactured system. The reliability of such a system is its probability of functioning correctly (and, hence, the reliability is $\leq1$, in general). The reliability function is the same probability as a function of time and/or other parameters involved in the system. There is, e.g., the reliability function of a communication channel, cf. [[Erroneous decoding, probability of|Erroneous decoding, probability of]].