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  2. Purchase returns journal - Wikipedia

    en.wikipedia.org/wiki/Purchase_returns_journal

    A purchase returns journal (also known as returns outwards journal/purchase debits daybook) is a prime entry book or a daybook which is used to record purchase returns.In other words, it is the journal which is used to record the goods which are returned to the suppliers.

  3. List of mathematical functions - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_functions

    In mathematics, some functions or groups of functions are important enough to deserve their own names. This is a listing of articles which explain some of these functions in more detail. There is a large theory of special functions which developed out of statistics and mathematical physics.

  4. Logarithmic spiral - Wikipedia

    en.wikipedia.org/wiki/Logarithmic_spiral

    The golden spiral is a logarithmic spiral that grows outward by a factor of the golden ratio for every 90 degrees of rotation (pitch angle about 17.03239 degrees). It can be approximated by a "Fibonacci spiral", made of a sequence of quarter circles with radii proportional to Fibonacci numbers .

  5. Involution (mathematics) - Wikipedia

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

    Any involution is a bijection.. The identity map is a trivial example of an involution. Examples of nontrivial involutions include negation (x ↦ −x), reciprocation (x ↦ 1/x), and complex conjugation (z ↦ z) in arithmetic; reflection, half-turn rotation, and circle inversion in geometry; complementation in set theory; and reciprocal ciphers such as the ROT13 transformation and the ...

  6. Mathematical proof - Wikipedia

    en.wikipedia.org/wiki/Mathematical_proof

    That is, a 2 is even, which implies that a must also be even, as seen in the proposition above (in #Proof by contraposition). So we can write a = 2c, where c is also an integer. Substitution into the original equation yields 2b 2 = (2c) 2 = 4c 2. Dividing both sides by 2 yields b 2 = 2c 2. But then, by the same argument as before, 2 divides b 2 ...

  7. Normal (geometry) - Wikipedia

    en.wikipedia.org/wiki/Normal_(geometry)

    The normal ray is the outward-pointing ray perpendicular to the surface of an optical medium at a given point. [2] In reflection of light, the angle of incidence and the angle of reflection are respectively the angle between the normal and the incident ray (on the plane of incidence) and the angle between the normal and the reflected ray.

  8. Convex cone - Wikipedia

    en.wikipedia.org/wiki/Convex_cone

    The class of convex cones is also closed under arbitrary linear maps. In particular, if C {\displaystyle C} is a convex cone, so is its opposite − C {\displaystyle -C} , and C ∩ − C {\displaystyle C\cap -C} is the largest linear subspace contained in C {\displaystyle C} .

  9. Returns (economics) - Wikipedia

    en.wikipedia.org/wiki/Returns_(economics)

    In Classical Economics profit is the return to the proprietor(s) of capital stocks (machinery, tools, structures). If I lease a backhoe from a tool rental company the amount I pay to the backhoe owner it is seen by me as "rent". But that same flow as seen by the supplier of the backhoe is "interest" (i.e. the return to loaned stock/money).

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