منابع مشابه
Isomorphisms of symplectic planes
Every nondesarguesian symplectic spread is also symplectic over its kernel. Any equivalence of nondesarguesian symplectic spreads preserves the resulting symplectic structures over the kernels. 2000 Mathematics Subject Classification. Primary 51A35, 51A40; Secondary 51A50
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For graphs G and G' with minimum degree is = 3 and satisfying one of two other conditions, we prove that any isomorphism from the P4 -graph P4 (G) to P4 ( G') can be induced by a vertex-isomorphism of G onto G'. We also prove that a connected graph G is isomorphic to its P4 -graph P4 (G) if and only if G is a cycle of length at least 4.
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ژورنال
عنوان ژورنال: advg
سال: 2007
ISSN: 1615-7168,1615-715X
DOI: 10.1515/advgeom.2007.033