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2. Glossary of mathematical symbols - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_mathematical...

   Glossary of mathematical symbols. A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various ...

3. Pi - Wikipedia

   en.wikipedia.org/wiki/Pi

   t. e. The number π (/ paɪ /; spelled out as " pi ") is a mathematical constant that is the ratio of a circle 's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics.

4. Prime number - Wikipedia

   en.wikipedia.org/wiki/Prime_number

   A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways of writing it as a product, 1 × 5 or 5 × 1, involve 5 itself. However, 4 is composite because it is a ...

5. Matrix (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Matrix_(mathematics)

   Matrix (mathematics) An m × n matrix: the m rows are horizontal and the n columns are vertical. Each element of a matrix is often denoted by a variable with two subscripts. For example, a2,1 represents the element at the second row and first column of the matrix. In mathematics, a matrix (pl.: matrices) is a rectangular array or table of ...

6. Birmingham, Alabama, leaders plead for information on mass ...

   www.aol.com/news/birmingham-alabama-leaders...

   The number of bullets fired and audio that captured the rapid pace of the shots has led authorities to believe the weapons used fired like automatics, Woodfin said.

7. Number theory - Wikipedia

   en.wikipedia.org/wiki/Number_theory

   An algebraic number is any complex number that is a solution to some polynomial equation () = with rational coefficients; for example, every solution of + (/) + = (say) is an algebraic number. Fields of algebraic numbers are also called algebraic number fields , or shortly number fields .