Abstract
This paper is a continuation of [2], presenting some more
results leading to establishing a complete list of irreducible non-embeddable
graphs for the projective plane. The main result presented here is
the following theorem: all irreducible non-embeddable graphs for the
projective plane which have a subgraph contractable to $E sub 2$ and
do not have a subgraph contractable to $E sub 1$ or $GAMMA sub 1$ or
$K sub 3,4$ are contractable to one of the 3 graphs $F sub 3, F sub 4$
or $E sub 20$ in [E].
Notes
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