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Simple one‐point extensions of tournaments
Author(s) -
Erdős P.,
Hajnal A.,
Milner E. C.
Publication year - 1972
Publication title -
mathematika
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.955
H-Index - 29
eISSN - 2041-7942
pISSN - 0025-5793
DOI - 10.1112/s0025579300004939
Subject(s) - citation , simple (philosophy) , library science , point (geometry) , computer science , mathematics , combinatorics , philosophy , epistemology , geometry
x->y,x=y,y->x holds. Here x -+ y expresses the fact that {x, y} e -+ and we sometimes write this in the alternative form y <--x . Extending the notation to subsets of T we write A --+ B or B is a subtournament of .l, and i is an extension of ,T', if T' e T and -+' is the restriction of --+ to T' ; we will usually write instead of . In particular, if I T T'I = k, we call .T a k-point extension of J7' .