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  2. AOL Mail

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  3. Reciprocity law - Wikipedia

    en.wikipedia.org/wiki/Reciprocity_law

    In mathematics, a reciprocity law is a generalization of the law of quadratic reciprocity to arbitrary monic irreducible polynomials () with integer coefficients. Recall that first reciprocity law, quadratic reciprocity, determines when an irreducible polynomial () = + + splits into linear terms when reduced mod .

  4. Structure factor - Wikipedia

    en.wikipedia.org/wiki/Structure_factor

    The structure factor is a critical tool in the interpretation of scattering patterns (interference patterns) obtained in X-ray, electron and neutron diffraction experiments. Confusingly, there are two different mathematical expressions in use, both called 'structure factor'.

  5. Rule of four - Wikipedia

    en.wikipedia.org/wiki/Rule_of_four

    The "Rule of Four" has been explained by various Justices in judicial opinions throughout the years. [2] For example, Justice Felix Frankfurter described the rule as follows: "The 'rule of four' is not a command of Congress. It is a working rule devised by the Court as a practical mode of determining that a case is deserving of review, the ...

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  7. Order of operations - Wikipedia

    en.wikipedia.org/wiki/Order_of_operations

    [6] [7] [a] The parentheses can be omitted if the input is a single numerical variable or constant, [2] as in the case of sin x = sin(x) and sin π = sin(π). [a] Traditionally this convention extends to monomials; thus, sin 3x = sin(3x) and even sin ⁠ 1 / 2 ⁠ xy = sin(xy/2), but sin x + y = sin(x) + y, because x + y is not a monomial ...

  8. Differentiation rules - Wikipedia

    en.wikipedia.org/wiki/Differentiation_rules

    These rules are given in many books, both on elementary and advanced calculus, in pure and applied mathematics. Those in this article (in addition to the above references) can be found in: Mathematical Handbook of Formulas and Tables (3rd edition) , S. Lipschutz, M.R. Spiegel, J. Liu, Schaum's Outline Series, 2009, ISBN 978-0-07-154855-7 .

  9. Military helicopter makes emergency landing on California ...

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    Flames could be seen where a military helicopter made an emergency landing at Camp Pendleton on Friday, causing police to warn drivers of potential traffic delays along Interstate 5. All four crew ...