منابع مشابه
Analogs & duals of the MAST problem for sequences & trees
Two natural kinds of problems about “structured collections of symbols” can be generally referred to as the LARGEST COMMON SUBOBJECT and the SMALLEST COMMON SUPEROBJECT problems, which we consider here as the dual problems of interest. For the case of rooted binary trees where the symbols occur as leaf-labels and a subobject is defined by label-respecting hereditary topological containment, bot...
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For every oriented tree T there exists a graph DT (called the dual of T ) such that T 6→ G ⇔ G → DT holds for every G (an arrow denotes the existence of a homomorphism). An explicit construction of DT has been found recently. Although the DT constructed this way may have exponential number of vertices in |V (T )| = n, we will prove that its diameter is linear in n (and therefore DT is ”small” i...
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ژورنال
عنوان ژورنال: Notre Dame Journal of Formal Logic
سال: 1972
ISSN: 0029-4527
DOI: 10.1305/ndjfl/1093890628