# When Was A Graph First Used?

## How is graph theory used today?

Graph theoretical concepts are widely used to study and model various applications, in different areas.

They include, study of molecules, construction of bonds in chemistry and the study of atoms.

Similarly, graph theory is used in sociology for example to measure actors prestige or to explore diffusion mechanisms..

## Where graphs are used in real life?

For those in a computer field, as in networking, the use of graphs can be very useful to measure trafficking to a site. Graphs are used in everyday life, from the local newspaper to the magazine stand. It is one of those skills that you simply cannot do without.

## Who created the line graph?

William PlayfairLine graph/Inventors

## Who is the father of analysis?

Karl Theodor Wilhelm WeierstrassKarl Theodor Wilhelm Weierstrass (German: Weierstraß [ˈvaɪɐʃtʁaːs]; 31 October 1815 – 19 February 1897) was a German mathematician often cited as the “father of modern analysis”.

## What is a graph and when was it first used?

At its core, graphs were first used as a purely mathematical way to solve a fun problem. In the former city of Königsberg, Prussia, currently Kaliningrad, Russia, there are four land masses separated by water with seven bridges connecting these landmasses.

## What is graph and its application?

A graph is a non-linear data structure, which consists of vertices(or nodes) connected by edges(or arcs) where edges may be directed or undirected. In Computer science graphs are used to represent the flow of computation. … In World Wide Web, web pages are considered to be the vertices.

## Who invented histogram?

Karl Pearsonacademic and learned online publications, take this extract from an online entry for “Karl Pearson: “Two days later he [i.e., Pearson] introduced the histogram – a term he coined to designate a ‘time-diagram’ to be used for historical purposes” (StabProb, entry “Karl Pearson”).

## What is the origin of graph?

Elements of a Graph A graph consists of two axes called the x (horizontal) and y (vertical) axes. … The point where the two axes intersect is called the origin. The origin is also identified as the point (0, 0).

## What does bar graph mean?

A bar graph is a chart that plots data using rectangular bars or columns (called bins) that represent the total amount of observations in the data for that category.

## Who invented math?

Beginning in the 6th century BC with the Pythagoreans, the Ancient Greeks began a systematic study of mathematics as a subject in its own right with Greek mathematics. Around 300 BC, Euclid introduced the axiomatic method still used in mathematics today, consisting of definition, axiom, theorem, and proof.

## When was the first graph made?

1786William Playfair created the first known line chart in 1786. The use of statistical graphics did not proliferate in Playfair’s lifetime—he died in 1823. But by the beginning of the 20th Century, graphical representations of data were common in textbooks and used by governments, financiers, and scientists.

## Why do we use graph theory?

Graph Theory is ultimately the study of relationships. Given a set of nodes & connections, which can abstract anything from city layouts to computer data, graph theory provides a helpful tool to quantify & simplify the many moving parts of dynamic systems.

## Who is the father of graph?

Eulerian refers to the Swiss mathematician Leonhard Euler, who invented graph theory in the 18th century.

## What does graph mean?

noun. a diagram representing a system of connections or interrelations among two or more things by a number of distinctive dots, lines, bars, etc. Mathematics. a series of points, discrete or continuous, as in forming a curve or surface, each of which represents a value of a given function. Also called linear graph .

## How is graph theory used in real life?

Graph theory and probability make it possible to guarantee a reliable service, for example by finding diversions when a particular connection is busy. All roads and motorways also form a large network, which is used by navigation services like Google Maps when working out the shortest route between two given points.

## What is an example of graph?

The definition of a graph is a diagram showing the relationships between two or more things. An example of graph is a pie chart. … A pictorial device, such as a pie chart or bar graph, used to illustrate quantitative relationships.

## What are the applications of graphs?

Graphs are used to define the flow of computation. Graphs are used to represent networks of communication. Graphs are used to represent data organization. Graph transformation systems work on rule-based in-memory manipulation of graphs.

## Why do we need graph?

Graphs are a common method to visually illustrate relationships in the data. The purpose of a graph is to present data that are too numerous or complicated to be described adequately in the text and in less space. … If the data shows pronounced trends or reveals relations between variables, a graph should be used.

## What are graphs and its types?

There are several different types of charts and graphs. The four most common are probably line graphs, bar graphs and histograms, pie charts, and Cartesian graphs. They are generally used for, and are best for, quite different things.

## Who created the bar graph?

William PlayfairBar chart/InventorsWilliam Playfair (1759-1823) wasn’t sure himself whether he had actually invented the bar graph and the line graph.

## What is a k4 graph?

K4 is a maximal planar graph which can be seen easily. In fact, a planar graph G is a maximal planar graph if and only if each face is of length three in any planar embedding of G. Corollary 1.8. 2: The number of edges in a maximal planar graph is 3n-6.