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  2. Addition - Wikipedia

    en.wikipedia.org/wiki/Addition

    A far-reaching generalization of addition of natural numbers is the addition of ordinal numbers and cardinal numbers in set theory. These give two different generalizations of addition of natural numbers to the transfinite. Unlike most addition operations, addition of ordinal numbers is not commutative. [77]

  3. Summation - Wikipedia

    en.wikipedia.org/wiki/Summation

    In mathematics, summation is the addition of a sequence of numbers, called addends or summands; the result is their sum or total.Beside numbers, other types of values can be summed as well: functions, vectors, matrices, polynomials and, in general, elements of any type of mathematical objects on which an operation denoted "+" is defined.

  4. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    Cardinal numbers, like one, two, and three, are numbers that express the quantity of objects. They answer the question "how many?". Ordinal numbers, such as first, second, and third, indicate order or placement in a series. They answer the question "what position?". [18] A number is rational if it can be represented as the ratio of two

  5. Algebra - Wikipedia

    en.wikipedia.org/wiki/Algebra

    This is the case because the sum of two even numbers is again an even number. But the set of odd integers together with addition is not a subalgebra because it is not closed: adding two odd numbers produces an even number, which is not part of the chosen subset. [83] Universal algebra is the study of algebraic structures in general.

  6. Joe Manchin torches Democrats on the way out the door - AOL

    www.aol.com/news/joe-manchin-torches-democrats...

    The senator added the third party would be called the “American Party” and would serve as a space for moderate Democrats and Republicans. But he shared he would not be its leader. “I’ll be ...

  7. 'Bleeding Eye' Virus Sparks Travel Warning and Worldwide ...

    www.aol.com/bleeding-eye-virus-sparks-travel...

    Marburg is a rare but “severe hemorrhagic fever that can cause serious illness and death,” the U.S. Centers for Disease Control says, adding that there is no treatment or vaccine for it.

  8. As Trump’s DOGE plans crackdown, Social Security union ...

    www.aol.com/trump-doge-plans-crackdown-social...

    The agreement comes as the incoming Trump administration and its newly created Department of Government Efficiency, or DOGE, vow to require federal workers to return to the office full time in an ...

  9. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    The modern study of number theory in its abstract form is largely attributed to Pierre de Fermat and Leonhard Euler. The field came to full fruition with the contributions of Adrien-Marie Legendre and Carl Friedrich Gauss. [17] Many easily stated number problems have solutions that require sophisticated methods, often from across mathematics.

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