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Can we use the term "black box" to speak about an algorithm which has a polynomial complexity but for which we don't know exactly how are made the calculations?

In fact I would like to explain that we assume that an algorithm cannot be executed incrementally, i.e., having a part of the input, for instance the first 50%, we cannot progress the computations of this algorithm.

Can the term "black box" be understood in this sense?

Thank you very much.

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    $\begingroup$ I don't understand your second paragraph. But "black box" usually means something whose workings are unknowable; we only see the input and output. $\endgroup$
    – usul
    Aug 6 '16 at 11:19
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    $\begingroup$ Ore you looking for the term "oracle"? $\endgroup$
    – Raphael
    Sep 4 '16 at 21:10

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