Abstract

The 3-decomposition conjecture is wide open. It asserts that every finite connected cubic graph can be decomposed into a spanning tree, a disjoint union of cycles, and a matching. We prove that the following graphs are reducible configurations for the 3-decomposition conjecture: the triangle, the K2,3, the claw-square, the twin-house, and the domino. As an application, we show that all 3-connected cubic graphs of path-width at most 4 satisfy the 3-decomposition conjecture.

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