The K_(n+5) and K_(3²,1^n) families are obstructions to n-apex
classification
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keywords
apexfamiliesnablaobstructionsconjectureevidencegiveproperty
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We give evidence in support of a conjecture that the $\nabla$Y$\nabla$ families of $K_{n+5}$ and $K_{3^2,1^n}$ are obstructions for the $n$-apex property.
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