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  2. Proportionality (mathematics) - Wikipedia

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

    With inverse proportion, an increase in one variable is associated with a decrease in the other. For instance, in travel, a constant speed dictates a direct proportion between distance and time travelled; in contrast, for a given distance (the constant), the time of travel is inversely proportional to speed: s × t = d.

  3. Table of mathematical symbols by introduction date - Wikipedia

    en.wikipedia.org/wiki/Table_of_mathematical...

    proportion sign: n √ radical symbol ... (less-than or equals to sign and greater-than or equals to sign) 1670 (with the horizontal bar over the inequality sign ...

  4. Glossary of mathematical symbols - Wikipedia

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

    2. Double factorial: if n is a positive integer, n!! is the product of all positive integers up to n with the same parity as n, and is read as "the double factorial of n". 3. Subfactorial: if n is a positive integer, !n is the number of derangements of a set of n elements, and is read as "the subfactorial of n". *

  5. Proportional reasoning - Wikipedia

    en.wikipedia.org/wiki/Proportional_reasoning

    Now consider our inverse proportion using the "water triangle". Let L be the height of the water on the left side and R be the height of the water on the right side, then the correct multiplicative strategy can be expressed as L × R = 24; this is a constant product relation.

  6. Talk:Proportionality (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Talk:Proportionality...

    Since there NO charts showing negative slopes, some beginning readers might incorrectly think that direct means positive and inverse means negative. And the examples in the inverse section also involve a negative proportion, so again, we might mislead people that don't read very closely. Waxmop 18:36, 1 December 2013 (UTC)

  7. Mathematical operators and symbols in Unicode - Wikipedia

    en.wikipedia.org/wiki/Mathematical_operators_and...

    female sign u+2642: ♂: male sign u+2660: ♠: black spade suit u+2661 ♡ white heart suit u+2662 ♢ white diamond suit u+2663: ♣: black club suit u+266d ♭ music flat sign u+266e ♮ music natural sign u+266f ♯ music sharp sign

  8. Proportion (mathematics) - Wikipedia

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

    A proportion is a mathematical statement expressing equality of two ratios. [1] [2]: =: a and d are called extremes, b and c are called means. Proportion can be written as =, where ratios are expressed as fractions.

  9. List of typographical symbols and punctuation marks - Wikipedia

    en.wikipedia.org/wiki/List_of_typographical...

    Feminine ordinal indicator, Degree sign: −: Minus sign: Hyphen-minus, Commercial minus: ×: Multiplication sign: X mark # Number sign: Numero sign. Also known as "octothorpe", "hash" and "hashtag sign" Pound sign № Numero sign: Number sign: Obelus: Division sign, Dagger, Commercial minus, Index ( ) Parenthesis: Bracket, Angle bracket ...