Symmetric and Transitive Relation is not necessarily Reflexive/Examples/Subset of Cartesian Plane/Mistake

Source Work

 * Chapter $\text{I}$: Sets and Functions
 * Relations
 * Relations

Mistake

 * The shaded regions represent relations
 * Symmetric-Transitive-NonReflexive-Mistake.png

Symmetric and transitive, but not reflexive

Correction
The annotations to the lower corner points of the shaded region are incorrect.

This is what they should look like:


 * Symmetric-Transitive-NonReflexive.png