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  2. Order of operations - Wikipedia

    en.wikipedia.org/wiki/Order_of_operations

    If exponentiation is indicated by stacked symbols using superscript notation, the usual rule is to work from the top down: [2] [7] a b c = a (b c) which typically is not equal to (a b) c. This convention is useful because there is a property of exponentiation that (a b) c = a bc, so it's unnecessary to use serial exponentiation for this.

  3. Consonant voicing and devoicing - Wikipedia

    en.wikipedia.org/wiki/Consonant_voicing_and...

    For example, the English suffix -s is pronounced [s] when it follows a voiceless phoneme (cats), and [z] when it follows a voiced phoneme (dogs). [1] This type of assimilation is called progressive , where the second consonant assimilates to the first; regressive assimilation goes in the opposite direction, as can be seen in have to [hæftə] .

  4. Cartesian coordinate system - Wikipedia

    en.wikipedia.org/wiki/Cartesian_coordinate_system

    The orientation is usually chosen so that the 90-degree angle from the first axis to the second axis looks counter-clockwise when seen from the point (0, 0, 1); a convention that is commonly called the right-hand rule. The coordinate surfaces of the Cartesian coordinates (x, y, z). The z-axis is vertical and the x-axis is

  5. Associative property - Wikipedia

    en.wikipedia.org/wiki/Associative_property

    For example, the order does not matter in the multiplication of real numbers, that is, a × b = b × a, so we say that the multiplication of real numbers is a commutative operation. However, operations such as function composition and matrix multiplication are associative, but not (generally) commutative.

  6. Impedance parameters - Wikipedia

    en.wikipedia.org/wiki/Impedance_parameters

    where Z is an N × N matrix the elements of which can be indexed using conventional matrix notation. In general the elements of the Z-parameter matrix are complex numbers and functions of frequency. For a one-port network, the Z-matrix reduces to a single element, being the ordinary impedance measured between the two terminals. The Z-parameters ...

  7. “What’s The Creepiest Display Of Intelligence You’ve Seen By ...

    www.aol.com/23-creepiest-displays-intelligence...

    Image credits: CommunicationIll4733 #5. I had a friend from childhood who had an [eidetic] memory. He never forgets anything. At primary school he had a lot of problems because he couldn't accept ...

  8. List of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/List_of_trigonometric...

    An important application is the integration of non-trigonometric functions: a common technique involves first using the substitution rule with a trigonometric function, and then simplifying the resulting integral with a trigonometric identity.

  9. Sum and Product Puzzle - Wikipedia

    en.wikipedia.org/wiki/Sum_and_Product_Puzzle

    From this, S now knows that of the possible pairs based on the sum (viz. 2+15, 3+14, 4+13, 5+12, 6+11, 7+10, 8+9) only one has a product that would allow P to deduce the answer, that being 4 + 13. The reader can then deduce the only possible solution based on the fact that S was able to determine it.