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  2. Home warranty - Wikipedia

    en.wikipedia.org/wiki/Home_warranty

    However, the words "home warranty" are not always used explicitly to mean a legal warranty is being conveyed. In many cases, at least in the United States, a home warranty is not a warranty at all, but rather a home service contract that covers the repair and/or replacement costs of home appliances , major systems such as heating and cooling ...

  3. Galois theory - Wikipedia

    en.wikipedia.org/wiki/Galois_theory

    In this vein, the discriminant is a symmetric function in the roots that reflects properties of the roots – it is zero if and only if the polynomial has a multiple root, and for quadratic and cubic polynomials it is positive if and only if all roots are real and distinct, and negative if and only if there is a pair of distinct complex ...

  4. Square root - Wikipedia

    en.wikipedia.org/wiki/Square_root

    The square root of a positive integer is the product of the roots of its prime factors, because the square root of a product is the product of the square roots of the factors. Since p 2 k = p k , {\textstyle {\sqrt {p^{2k}}}=p^{k},} only roots of those primes having an odd power in the factorization are necessary.

  5. 144 (number) - Wikipedia

    en.wikipedia.org/wiki/144_(number)

    144 (one hundred [and] forty-four) is the natural number following 143 and preceding 145. It is coincidentally both the square of twelve (a dozen dozens , or one gross .) and the twelfth Fibonacci number , and the only nontrivial number in the sequence that is square.

  6. Methods of computing square roots - Wikipedia

    en.wikipedia.org/wiki/Methods_of_computing...

    A method analogous to piece-wise linear approximation but using only arithmetic instead of algebraic equations, uses the multiplication tables in reverse: the square root of a number between 1 and 100 is between 1 and 10, so if we know 25 is a perfect square (5 × 5), and 36 is a perfect square (6 × 6), then the square root of a number greater than or equal to 25 but less than 36, begins with ...

  7. Sum of two squares theorem - Wikipedia

    en.wikipedia.org/wiki/Sum_of_two_squares_theorem

    Two-square theorem — Denote the number of divisors of as (), and write () for the number of those divisors with . Let n = 2 f p 1 r 1 p 2 r 2 ⋯ q 1 s 1 q 2 s 2 ⋯ {\displaystyle n=2^{f}p_{1}^{r_{1}}p_{2}^{r_{2}}\cdots q_{1}^{s_{1}}q_{2}^{s_{2}}\cdots } where p i ≡ 1 mod 4 , q i ≡ 3 mod 4 {\displaystyle p_{i}\equiv 1{\bmod {4}},\ q_{i ...

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