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  2. Double counting (proof technique) - Wikipedia

    en.wikipedia.org/wiki/Double_counting_(proof...

    Where double counting involves counting one set in two ways, bijective proofs involve counting two sets in one way, by showing that their elements correspond one-for-one. The inclusion–exclusion principle , a formula for the size of a union of sets that may, together with another formula for the same union, be used as part of a double ...

  3. Help:Displaying a formula - Wikipedia

    en.wikipedia.org/wiki/Help:Displaying_a_formula

    If nothing is specified, the equation is rendered in the same display style as "block", but without using a new paragraph. If the equation does appear on a line by itself, it is not automatically indented. The sum = converges to 2. The next line-width is disturbed by large operators. Or: The sum

  4. Wikipedia : Manual of Style/Mathematics

    en.wikipedia.org/wiki/Wikipedia:Manual_of_Style/...

    Adding display=inline renders exponents lower, especially under square roots, often resulting in a smaller square root which fits better in inline text: compare <math> \sqrt {x ^ 2+y ^ 2} </math> to <math display=inline> \sqrt {x ^ 2+y ^ 2} </math> which render as + and +, respectively.

  5. Formula editor - Wikipedia

    en.wikipedia.org/wiki/Formula_editor

    Online LaTeX equation editor with real-time .png, .pdf, and .tex output. Customizable resolution, font, and color. One click copy to MS Word 2007+ using MathML. Formulator MathML Weaver: Yes Yes No No Yes Yes No No Dual-licensing (Open source and commercial). There is a special edition that works within a browser (using Silverlight plugin ...

  6. Elementary algebra - Wikipedia

    en.wikipedia.org/wiki/Elementary_algebra

    A quadratic equation is one which includes a term with an exponent of 2, for example, , [40] and no term with higher exponent. The name derives from the Latin quadrus , meaning square. [ 41 ] In general, a quadratic equation can be expressed in the form a x 2 + b x + c = 0 {\displaystyle ax^{2}+bx+c=0} , [ 42 ] where a is not zero (if it were ...

  7. Addition - Wikipedia

    en.wikipedia.org/wiki/Addition

    A number-line visualization of the algebraic addition 2 + 4 = 6. A "jump" that has a distance of 2 followed by another that is long as 4, is the same as a translation by 6. A number-line visualization of the unary addition 2 + 4 = 6. A translation by 4 is equivalent to four translations by 1.

  8. Mathematical markup language - Wikipedia

    en.wikipedia.org/wiki/Mathematical_markup_language

    A mathematical markup language is a computer notation for representing mathematical formulae, based on mathematical notation.Specialized markup languages are necessary because computers normally deal with linear text and more limited character sets (although increasing support for Unicode is obsoleting very simple uses).

  9. Cross-multiplication - Wikipedia

    en.wikipedia.org/wiki/Cross-multiplication

    The method is also occasionally known as the "cross your heart" method because lines resembling a heart outline can be drawn to remember which things to multiply together. Given an equation like =, where b and d are not zero, one can cross-multiply to get