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2. Line graph - Wikipedia

   en.wikipedia.org/wiki/Line_graph

   If G is a directed graph, its directed line graph or line digraph has one vertex for each edge of G. Two vertices representing directed edges from u to v and from w to x in G are connected by an edge from uv to wx in the line digraph when v = w. That is, each edge in the line digraph of G represents a length-two directed path in G.

3. Locally linear graph - Wikipedia

   en.wikipedia.org/wiki/Locally_linear_graph

   Locally linear graphs may be formed from smaller locally linear graphs by the following operation, a form of the clique-sum operation on graphs. Let G {\displaystyle G} and H {\displaystyle H} be any two locally linear graphs, select a triangle from each of them, and glue the two graphs by merging together corresponding pairs of vertices in the ...

4. Line chart - Wikipedia

   en.wikipedia.org/wiki/Line_chart

   Line chart showing the population of the town of Pushkin, Saint Petersburg from 1800 to 2010, measured at various intervals. A line chart or line graph, also known as curve chart, [1] is a type of chart that displays information as a series of data points called 'markers' connected by straight line segments. [2]

5. Curve fitting - Wikipedia

   en.wikipedia.org/wiki/Curve_fitting

   Polynomial curves fitting points generated with a sine function. The black dotted line is the "true" data, the red line is a first degree polynomial, the green line is second degree, the orange line is third degree and the blue line is fourth degree. The first degree polynomial equation = + is a line with slope a. A line will connect any two ...

6. Tree (graph theory) - Wikipedia

   en.wikipedia.org/wiki/Tree_(graph_theory)

   A path graph (or linear graph) consists of n vertices arranged in a line, so that vertices i and i + 1 are connected by an edge for i = 1, …, n – 1. A starlike tree consists of a central vertex called root and several path graphs attached to it. More formally, a tree is starlike if it has exactly one vertex of degree greater than 2.

7. Linear function (calculus) - Wikipedia

   en.wikipedia.org/wiki/Linear_function_(calculus)

   In calculus and related areas of mathematics, a linear function from the real numbers to the real numbers is a function whose graph (in Cartesian coordinates) is a non-vertical line in the plane. [1] The characteristic property of linear functions is that when the input variable is changed, the change in the output is proportional to the change ...