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  2. Central line (geometry) - Wikipedia

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

    The special property that distinguishes a straight line as a central line is manifested via the equation of the line in trilinear coordinates. This special property is related to the concept of triangle center also. The concept of a central line was introduced by Clark Kimberling in a paper published in 1994. [1] [2]

  3. Graph labeling - Wikipedia

    en.wikipedia.org/wiki/Graph_labeling

    In the mathematical discipline of graph theory, a graph labeling is the assignment of labels, traditionally represented by integers, to edges and/or vertices of a graph. [1] Formally, given a graph G = (V, E), a vertex labeling is a function of V to a set of labels; a graph with such a function defined is called a vertex-labeled graph.

  4. Hatch mark - Wikipedia

    en.wikipedia.org/wiki/Hatch_mark

    Unit-and-value hatch marks are short vertical line segments which mark distances. They are seen on rulers and number lines. The marks are parallel to each other in an evenly-spaced manner. The distance between adjacent marks is one unit. Longer line segments are used for integers and natural numbers. Shorter line segments are used for fractions.

  5. Locus (mathematics) - Wikipedia

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

    Each curve in this example is a locus defined as the conchoid of the point P and the line l.In this example, P is 8 cm from l. In geometry, a locus (plural: loci) (Latin word for "place", "location") is a set of all points (commonly, a line, a line segment, a curve or a surface), whose location satisfies or is determined by one or more specified conditions.

  6. Higher Secondary Certificate - Wikipedia

    en.wikipedia.org/wiki/Higher_Secondary_Certificate

    The Higher Secondary School Certificate (HSSC), also known as Intermediate, is a public examination taken by students at Higher Secondary School or Intermediate college (Junior college) in Pakistan. After finishing Matriculation in Grade 9 and 10, the students then enter an intermediate college and complete grades 11 and 12.

  7. Graph (discrete mathematics) - Wikipedia

    en.wikipedia.org/wiki/Graph_(discrete_mathematics)

    In a graph of order n, the maximum degree of each vertex is n − 1 (or n + 1 if loops are allowed, because a loop contributes 2 to the degree), and the maximum number of edges is n(n − 1)/2 (or n(n + 1)/2 if loops are allowed). The edges of a graph define a symmetric relation on the vertices, called the adjacency relation.

  8. Envelope (mathematics) - Wikipedia

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

    It follows that at least one tangent line to γ must pass through any given point in the plane. If y > x 3 and y > 0 then each point (x,y) has exactly one tangent line to γ passing through it. The same is true if y < x 3 y < 0. If y < x 3 and y > 0 then each point (x,y) has exactly three distinct

  9. Centre (geometry) - Wikipedia

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

    A symmetry of the projective plane with a given conic relates every point or pole to a line called its polar. The concept of centre in projective geometry uses this relation. The following assertions are from G. B. Halsted. [3] The harmonic conjugate of a point at infinity with respect to the end points of a finite sect is the 'centre' of that ...