Symmetry in Graphs of Functions and Relations

Initializing live version
Download to Desktop

Requires a Wolfram Notebook System

Interact on desktop, mobile and cloud with the free Wolfram Player or other Wolfram Language products.

This Demonstration shows the three types of symmetry commonly studied in graphs: symmetry with respect to the axis, the axis, or the origin.

[more]

A graph has symmetry with respect to the axis if reflecting it across the axis yields an identical graph. The graph of an equation has this symmetry if replacing with in the equation yields the identical equation.

A graph has symmetry with respect to the axis if reflecting it across the axis yields an identical graph. The graph of an equation has this symmetry if replacing with in the equation yields the identical equation.

A graph has symmetry with respect to the origin if reflecting the graph across both the axis and axis yields an identical graph. The graph of an equation has this symmetry if replacing with and with in the equation yields the identical equation.

[less]

Contributed by: Laura R. Lynch (June 2014)
Open content licensed under CC BY-NC-SA


Snapshots


Details

The graph of a function that is not identically zero is never symmetric with respect to the axis as it necessarily fails the vertical line test (e.g. and ). A function whose graph is symmetric with respect to the axis is called even (e.g. and ). A function whose graph is symmetric with respect to the origin is called odd (e.g. ).

Equations that are symmetric to both the axis and axis will necessarily also be symmetric with respect to the origin (e.g. ). However, this is not a requirement for a graph to be symmetric with respect to the origin (e.g. ).



Feedback (field required)
Email (field required) Name
Occupation Organization
Note: Your message & contact information may be shared with the author of any specific Demonstration for which you give feedback.
Send