Graphs Flashcards

1
Q

What is a graph?

A

A graph is a set of lines connecting points

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2
Q

What is a network?

A

A network is a graph (set of lines connecting points) with weighted edges

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3
Q

What is the name for 2 graphs which are the same?

A

Isomorphic

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4
Q

What does isomorphic mean?

A

2 graphs are the same

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5
Q

What is a degree/order?

A

The degree/order is the number of edges connected to a vertex

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6
Q

What can vertices be?

A

Vertices can be even or odd

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7
Q

What is a walk?

A

A walk is a sequences of edges where the end vertex of one edge is the start vertex of the next

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8
Q

What is a trail?

A

A trail is a walk (sequences of edges where the end vertex of one edge is the start of the next) where none of the edges are repeated

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9
Q

What is a path?

A

A path is a trail and where none of the vertices are repeated

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10
Q

What is a cycle/circuit?

A

A cycle/circuit is a closed path where the end of the path joins back to the beginning

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11
Q

What are other names for lines?

A

Edges/arcs

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12
Q

What are other names for points?

A

Vertices/nodes

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13
Q

What is a simple graph?

A

A simple graph has no loops and at most one edge connecting any pairs of vertices

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14
Q

When are 2 vertices connected?

A

2 vertices are connected if there is a path between them

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15
Q

What is a connected graph?

A

A connected graph is when all the pairs of vertices are connected

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16
Q

What is a tree?

A

A tree is a connected graph with no cycles

17
Q

What is a complete graph?

A

A complete graph is where every pair of vertices are connected by a single edge

18
Q

What is a complete graph with n vertices referred to as?

A

Kn

19
Q

What does Kn represent?

A

A complete graph with n vertices

20
Q

What is Hamiltonian cycle?

A

A Hamiltonian cycle is a cycle which visits every vertex but no edges nor vertices are repeated

21
Q

What is a planar graph?

A

A planar graph is a graph that can be drawn so no edges cross

22
Q

What is Euler’s formula for planar graphs?

A

v-e+f=2

23
Q

What is a digraph?

A

A digraph has one or more edges that have an arrow that indicates you can go in one direction