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  2. Cross-multiplication - Wikipedia

    en.wikipedia.org/wiki/Cross-multiplication

    The rule of three [1] was a historical shorthand version for a particular form of cross-multiplication that could be taught to students by rote. It was considered the height of Colonial maths education [ 2 ] and still figures in the French national curriculum for secondary education, [ 3 ] and in the primary education curriculum of Spain.

  3. Cross product - Wikipedia

    en.wikipedia.org/wiki/Cross_product

    As mentioned above, the Lie algebra R 3 with cross product is isomorphic to the Lie algebra so(3), whose elements can be identified with the 3×3 skew-symmetric matrices. The map a → [a] × provides an isomorphism between R 3 and so(3). Under this map, the cross product of 3-vectors corresponds to the commutator of 3x3 skew-symmetric matrices.

  4. Vector calculus identities - Wikipedia

    en.wikipedia.org/wiki/Vector_calculus_identities

    2.3 Product rule for multiplication by a scalar. 2.4 Quotient rule for division by a scalar. 2.5 Chain rule. 2.6 Dot product rule. ... Cross product rule

  5. Associative property - Wikipedia

    en.wikipedia.org/wiki/Associative_property

    In mathematics, addition and multiplication of real numbers are associative. By contrast, in computer science, addition and multiplication of floating point numbers are not associative, as different rounding errors may be introduced when dissimilar-sized values are joined in a different order. [7]

  6. Rule of marteloio - Wikipedia

    en.wikipedia.org/wiki/Rule_of_marteloio

    where 55 is the alargar for 100 miles (as given in the second column of the table at q = 3). This is easily done by the simple "Rule of Three", a method of cross-multiplication, using three numbers to solve for the fourth by successive multiplication and division: x = 65 × 55 ÷ 100

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    3 Things You Must Do When Your Savings Reach $50,000. These 11 Rare Coins Sold for Over $1 Million. The 5 Most Expensive End-of-Year Money Mistakes, According to Financial Advisors.

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    Nick Cannon recently said he has narcissistic personality disorder. What to know about narcissists and what the disorder really means.

  9. Triple product - Wikipedia

    en.wikipedia.org/wiki/Triple_product

    The three vectors spanning a parallelepiped have triple product equal to its volume. (However, beware that the direction of the arrows in this diagram are incorrect.) In exterior algebra and geometric algebra the exterior product of two vectors is a bivector, while the exterior product of three vectors is a trivector. A bivector is an oriented ...

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