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  2. Real coordinate space - Wikipedia

    en.wikipedia.org/wiki/Real_coordinate_space

    Special cases are called the real line R 1, the real coordinate plane R 2, and the real coordinate three-dimensional space R 3. With component-wise addition and scalar multiplication, it is a real vector space. The coordinates over any basis of the elements of a real vector space form a real coordinate space of the same dimension as that of the ...

  3. Algebraic geometry - Wikipedia

    en.wikipedia.org/wiki/Algebraic_geometry

    Real algebraic geometry is the study of real algebraic varieties. The fact that the field of the real numbers is an ordered field cannot be ignored in such a study. For example, the curve of equation x 2 + y 2 − a = 0 {\displaystyle x^{2}+y^{2}-a=0} is a circle if a > 0 {\displaystyle a>0} , but has no real points if a < 0 {\displaystyle a<0} .

  4. Geometric progression - Wikipedia

    en.wikipedia.org/wiki/Geometric_progression

    For example, the sequence 2, 6, 18, 54, ... is a geometric progression with a common ratio of 3. Similarly 10, 5, 2.5, 1.25, ... is a geometric sequence with a common ratio of 1/2. Examples of a geometric sequence are powers r k of a fixed non-zero number r, such as 2 k and 3 k. The general form of a geometric sequence is

  5. Real algebraic geometry - Wikipedia

    en.wikipedia.org/wiki/Real_algebraic_geometry

    Computational real algebraic geometry is concerned with the algorithmic aspects of real algebraic (and semialgebraic) geometry. The main algorithm is cylindrical algebraic decomposition. It is used to cut semialgebraic sets into nice pieces and to compute their projections. Real algebra is the part of algebra which is relevant to real algebraic ...

  6. Glossary of classical algebraic geometry - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_classical...

    A plane conic passing through the circular points at infinity. For real projective geometry this is much the same as a circle in the usual sense, but for complex projective geometry it is different: for example, circles have underlying topological spaces given by a 2-sphere rather than a 1-sphere. circuit A component of a real algebraic curve.

  7. Geometric series - Wikipedia

    en.wikipedia.org/wiki/Geometric_series

    The geometric series is an infinite series derived from a special type of sequence called a geometric progression.This means that it is the sum of infinitely many terms of geometric progression: starting from the initial term , and the next one being the initial term multiplied by a constant number known as the common ratio .

  8. Category:Real algebraic geometry - Wikipedia

    en.wikipedia.org/wiki/Category:Real_algebraic...

    Pages in category "Real algebraic geometry" The following 43 pages are in this category, out of 43 total. This list may not reflect recent changes. ...

  9. Net (mathematics) - Wikipedia

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

    In particular, the natural numbers together with the usual integer comparison preorder form the archetypical example of a directed set. A sequence is a function on the natural numbers, so every sequence ,, … in a topological space can be considered a net in defined on .

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