The Journal of Combinatorial Theory, Series A^{[1]} and Series B,^{[2]} are mathematical journals specializing in combinatorics and related areas. They are published by Elsevier. Series A is concerned primarily with structures, designs, and applications of combinatorics. Series B is concerned primarily with graph and matroid theory. The two series are two of the leading journals in the field and are widely known as JCTA and JCTB.^{[citation needed]}
Discipline  Mathematics 

Language  English 
Publication details  
History  1966present 
Publisher  
Frequency  Monthly 
Hybrid  
Standard abbreviations  
ISO 4  J. Comb. Theory 
MathSciNet  J. Combin. Theory 
Indexing  
Series A  
ISSN  00973165 
Series B  
ISSN  00958956 
Links  

The journal was founded in 1966 by Frank Harary and GianCarlo Rota.^{[3]} Originally there was only one journal, which was split into two parts in 1971 as the field grew rapidly.
In 2020, most of the editorial board of JCTA resigned to form a new, open access journal Combinatorial Theory. The new journal aims to be a continuation of JCTA independently from Elsevier.^{[4]}^{[5]}^{[6]} It published its first issue in December 2021.^{[7]}
Influential articles that appeared in the journal include Katona's elegant proof^{[8]} of the Erdős–Ko–Rado theorem and a series of papers spanning over 500 pages, appearing from 1983^{[9]} to 2004,^{[10]} by Neil Robertson and Paul D. Seymour on the topic of graph minors, which together constitute the proof of the graph minors theorem. Two articles proving Kneser's conjecture,^{[11]}^{[12]} the first by László Lovász and the other by Imre Bárány, appeared backtoback in the same issue of the journal.