Wikimedi'Òc

Mycielskian construction of 11-vertex Grotzsch graph.png - Magyar25

Square of a graph.svg - David Eppstein

Better-graph-cartesian-product-2.svg - Myrrhinos

Composition animation.gif - Scubatoad

Cograph example 1.png - Shager~commonswiki

Cograph example 2.png - Shager~commonswiki

Cograph g2.png - Shager~commonswiki

Cograph g1.png - Shager~commonswiki

Graph union.svg - Dammit

Corona product.svg - BagLuke