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  2. Counterexample - Wikipedia

    en.wikipedia.org/wiki/Counterexample

    In logic a counterexample disproves the generalization, and does so rigorously in the fields of mathematics and philosophy. [1] For example, the fact that "student John Smith is not lazy" is a counterexample to the generalization "students are lazy", and both a counterexample to, and disproof of, the universal quantification "all students are ...

  3. Kernel (category theory) - Wikipedia

    en.wikipedia.org/wiki/Kernel_(category_theory)

    Let C be a category.In order to define a kernel in the general category-theoretical sense, C needs to have zero morphisms.In that case, if f : X → Y is an arbitrary morphism in C, then a kernel of f is an equaliser of f and the zero morphism from X to Y.

  4. Portal:Mathematics/Featured picture archive - Wikipedia

    en.wikipedia.org/wiki/Portal:Mathematics/...

    Froebel star: November 2013: A line integral is an integral where the function to be integrated, be it a scalar field as here or a vector field, is evaluated along a curve.The value of the line integral is the sum of values of the field at all points on the curve, weighted by some scalar function on the curve (commonly arc length or, for a vector field, the scalar product of the vector field ...

  5. The internet can’t solve this third-grade math problem—can you?

    www.aol.com/article/lifestyle/2017/12/04/the...

    As simple as third grade may seem to be, this math problem that was posted on Reddit totally stumped students, parents, and the entire Internet.

  6. Equivalence of categories - Wikipedia

    en.wikipedia.org/wiki/Equivalence_of_categories

    In category theory, a branch of abstract mathematics, an equivalence of categories is a relation between two categories that establishes that these categories are "essentially the same". There are numerous examples of categorical equivalences from many areas of mathematics.

  7. Multiple representations (mathematics education) - Wikipedia

    en.wikipedia.org/wiki/Multiple_representations...

    The use of multiple representations supports and requires tasks that involve decision-making and other problem-solving skills. [2] [3] [4] The choice of which representation to use, the task of making representations given other representations, and the understanding of how changes in one representation affect others are examples of such mathematically sophisticated activities.

  8. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    To explain the process, consider one third of one quarter. Using the example of a cake, if three small slices of equal size make up a quarter, and four quarters make up a whole, twelve of these small, equal slices make up a whole. Therefore, a third of a quarter is a twelfth. Now consider the numerators.

  9. Model category - Wikipedia

    en.wikipedia.org/wiki/Model_category

    Dually, the injective model structure is similar with cofibrations and weak equivalences instead. In both cases the third class of morphisms is given by a lifting condition (see below). In some cases, when the category C is a Reedy category, there is a third model structure lying in between the projective and injective.