EntityQ7200963· pop 7· linked from 33 articlesplanar separator theoremSign in to savetheorem in graph theoryConnectionsbig O notationEntitytreeEntitytime complexityEntityisoperimetric inequalityEntityapproximation algorithmEntityminor graphEntitynearest neighbor graphEntitygraph partitionEntityparameterized complexityEntitybranch-decompositionEntityLeonhard EulerEntityleafEntityInternational Standard Book NumberEntitylogarithmEntityreal numberEntitysphereEntitydigital object identifierEntitymatrixEntityPaul ErdősEntitygraph theoryEntityCategoriesStatements about planar graphs