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  2. 2 + 2 = 5 - Wikipedia

    en.wikipedia.org/wiki/2_+_2_=_5

    As a theme and as a subject in the arts, the anti-intellectual slogan 2 + 2 = 5 pre-dates Orwell and has produced literature, such as Deux et deux font cinq (Two and Two Make Five), written in 1895 by Alphonse Allais, which is a collection of absurdist short stories; [1] and the 1920 imagist art manifesto 2 × 2 = 5 by the poet Vadim Shershenevich.

  3. Academic grading in Spain - Wikipedia

    en.wikipedia.org/wiki/Academic_grading_in_Spain

    Spanish universities use two different grading scales. The students' performance is assessed using a 0 to 10-point grading scale, where 10 corresponds to the 100% of the academical contents of the course which in turn are regulated by the Ministry of Education as established in the Spanish Constitution (Article 149) [2] and in the Organic Law for Universities. [3]

  4. Jet (mathematics) - Wikipedia

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

    The space of 2-jets of curves through a point. In a local coordinate system x i centered at a point p , we can express the second-order Taylor polynomial of a curve f ( t ) through p by J 0 2 ( x i ( f ) ) ( t ) = t d x i ( f ) d t ( 0 ) + t 2 2 d 2 x i ( f ) d t 2 ( 0 ) . {\displaystyle J_{0}^{2}(x^{i}(f))(t)=t{\frac {dx^{i}(f)}{dt}}(0)+{\frac ...

  5. Matrix multiplication - Wikipedia

    en.wikipedia.org/wiki/Matrix_multiplication

    Computing the k th power of a matrix needs k – 1 times the time of a single matrix multiplication, if it is done with the trivial algorithm (repeated multiplication). As this may be very time consuming, one generally prefers using exponentiation by squaring, which requires less than 2 log 2 k matrix multiplications, and is therefore much more ...

  6. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    Communication technologies apply branches of mathematics that may be very old (e.g., arithmetic), especially with respect to transmission security, in cryptography and coding theory. Discrete mathematics is useful in many areas of computer science, such as complexity theory , information theory , and graph theory . [ 138 ]

  7. Grade (slope) - Wikipedia

    en.wikipedia.org/wiki/Grade_(slope)

    Grade indicator near Bellville, Western Cape, South Africa, showing 1:150 and 1:88 grades. Ruling gradients limit the load that a locomotive can haul, including the weight of the locomotive itself. Gradients are expressed as a ratio of vertical rise to horizontal distance; for example, a 1% gradient (1 in 100) means the track rises 1 vertical ...