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  2. Leyland cypress - Wikipedia

    en.wikipedia.org/wiki/Leyland_cypress

    The tallest Leyland cypress documented is about 40 m (130 ft) tall and still growing. [18] However, because their roots are relatively shallow, a large leylandii tends to topple over. The shallow root structure also means that it is poorly adapted to areas with hot summers, such as the southern half of the United States.

  3. Dedekind sum - Wikipedia

    en.wikipedia.org/wiki/Dedekind_sum

    Note that D is symmetric in a and b, and hence (,;) = (,;),and that, by the oddness of (( )), D(−a, b; c) = −D(a, b; c), D(a, b; −c) = D(a, b; c).. By the periodicity of D in its first two arguments, the third argument being the length of the period for both,

  4. Abel's summation formula - Wikipedia

    en.wikipedia.org/wiki/Abel's_summation_formula

    Fix a complex number .If = for and () =, then () = ⌊ ⌋ and the formula becomes = ⌊ ⌋ = ⌊ ⌋ + ⌊ ⌋ +. If () >, then the limit as exists and yields the ...

  5. Valerie Bertinelli Is ‘Tired’ of Dyeing Her Gray Roots ‘Every ...

    www.aol.com/entertainment/valerie-bertinelli...

    While some of Bertinelli’s followers need to “chill out,” she praised “99.9%” of her fans for being “really kind, sweet people who don’t give a flying flip if I have roots or [if] I ...

  6. Matrix exponential - Wikipedia

    en.wikipedia.org/wiki/Matrix_exponential

    Letting a be a root of P, Q a,t (z) is solved from the product of P by the principal part of the Laurent series of f at a: It is proportional to the relevant Frobenius covariant. Then the sum S t of the Q a,t, where a runs over all the roots of P, can be taken as a particular Q t. All the other Q t will be obtained by adding a multiple of P to ...

  7. Newton's identities - Wikipedia

    en.wikipedia.org/wiki/Newton's_identities

    where the terms for i = 0 were taken out of the sum because p 0 is (usually) not defined. This equation immediately gives the k -th Newton identity in k variables. Since this is an identity of symmetric polynomials (homogeneous) of degree k , its validity for any number of variables follows from its validity for k variables.

  8. Subadditivity - Wikipedia

    en.wikipedia.org/wiki/Subadditivity

    A subadditive function is a function:, having a domain A and an ordered codomain B that are both closed under addition, with the following property: ,, (+) + ().. An example is the square root function, having the non-negative real numbers as domain and codomain: since , we have: + +.

  9. Ramanujan's sum - Wikipedia

    en.wikipedia.org/wiki/Ramanujan's_sum

    Therefore, there are φ(q) primitive q-th roots of unity. Thus, the Ramanujan sum c q (n) is the sum of the n-th powers of the primitive q-th roots of unity. It is a fact [3] that the powers of ζ q are precisely the primitive roots for all the divisors of q. Example. Let q = 12. Then