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In number theory, a narcissistic number [1] [2] (also known as a pluperfect digital invariant (PPDI), [3] an Armstrong number [4] (after Michael F. Armstrong) [5] or a plus perfect number) [6] in a given number base is a number that is the sum of its own digits each raised to the power of the number of digits.
Given a number base , a natural number with digits is an automorphic number if is a fixed point of the polynomial function = over /, the ring of integers modulo.As the inverse limit of / is , the ring of -adic integers, automorphic numbers are used to find the numerical representations of the fixed points of () = over .
The main objective of interval arithmetic is to provide a simple way of calculating upper and lower bounds of a function's range in one or more variables. These endpoints are not necessarily the true supremum or infimum of a range since the precise calculation of those values can be difficult or impossible; the bounds only need to contain the function's range as a subset.
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In summary, a set of the real numbers is an interval, if and only if it is an open interval, a closed interval, or a half-open interval. [4] [5] A degenerate interval is any set consisting of a single real number (i.e., an interval of the form [a, a]). [6] Some authors include the empty set in this definition.
Dar Global, the international arm of Saudi Arabia's Dar Al Arkan Real Estate Development Company 4300.SE, has agreed a number of deals with The Trump Organization, including plans for Trump towers ...
There are approximately 5.6 million former students currently in default, meaning their loans are at least 270 days behind on payment, who could be immediately affected when collections crank back ...
The following greedy algorithm finds a solution that contains at least 1/2 of the optimal number of intervals: [8] Select the interval, x, with the earliest finishing time. Remove x, and all intervals intersecting x, and all intervals in the same group of x, from the set of candidate intervals. Continue until the set of candidate intervals is ...