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A local approach to 1-homogeneous graphsJurišić, Aleksandar ; Koolen, JackNaj bo ▫$\Gamma$▫ razdaljno regularen graf z diametrom ▫$d$▫. Za vozlišči ▫$x$▫ in ▫$y$▫ grafa ▫$\Gamma$▫ na razdalji ▫$i$▫, ▫$1 \le i \le d$▫, definiramo množice ▫$C_i = \Gamma_{i-1}(x) \cap ... \Gamma(y)$▫, ▫$A_i(x,y) = \Gamma_i(x) \cap \Gamma(y)$▫ in ▫$B_i(x,y) = \Gamma_{i+1}(x) \cap \Gamma(y)$▫. Potem rečemo, da ima graf ▫$\Gamma$▫ lastnost CAB▫$_j$▫, če je particija ▫$CAB_i(x,y) = \{C_i(x,y), A_i(x,y), B_i(x,y)\}$▫ lokalnega grafa vozlišča ▫$y$▫ ekvitabilna za vsak par ▫$x$▫ in ▫$y$▫ grafa ▫$\Gamma$▫ na razdalji ▫$i \le j$▫. Graf ▫$\Gamma$▫ ima lastnost CAB, če ima lastnost CAB▫$_d$▫. Pokažemo ekvivalentnost lastnosti CAB in lastnosti 1-homogenosti v razdaljno regularnem grafu z ▫$a_1 \ne 0$▫ in klasificiramo 1-homogene Terwilligerjeve grafe s ▫$c_2 \ge 2$▫.Source: Preprint series. - ISSN 1318-4865 (Let. 37, št. 663, 1999, str. 1-20)Type of material - article, component partPublish date - 1999Language - englishCOBISS.SI-ID - 8982617
Author
Jurišić, Aleksandar |
Koolen, Jack
Topics
matematika |
algebraična kombinatorika |
teorija grafov |
razdaljno regularni grafi |
ekvitabilne particije |
1-homogenost |
lokalna krepka regularnost |
pravilni skoraj poligoni |
Terwilligerjevi grafi |
mathematics |
algebraic combinatorics |
distance-regular graphs |
equitable partitions |
1-homogeneous |
locally strongly-regular graphs |
regular near polygons |
Terwilliger graphs
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Jurišić, Aleksandar | 08724 |
Koolen, Jack |
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