perfect number
2.For a fixed positive integer k,if n satisfies f(n)=kn,then n is called a k fold S-perfect number.
4.Under the precondition of guaranteeing the property of perfect reconstruction and vanishing moments, this method first sets the number of the uncertain parameters in Bernstein polynomial, then optimizes them by genetic algorithms, a biorthogonal filter banks with arbitrary length and anti-symmetry is thus obtained.
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10.By the absolute coordinate method , the handle to the constrain equations of the system is fairly simpler , but a number of governing equation of the system is most . In addition , the numerical methods solved DAE aren’t perfect like the initial value problem of pure differential equations , and its intrinsic ill-condition can lead to many difficulties in the numerical calculation .
