95
Voted
DLT
2008
15 years 2 months ago
2008
We prove that, for the uniform distribution over all sets X of m (that is a fixed integer) non-empty words whose sum of lengths is n, DX , one of the usual deterministic automata r...
74
Voted
DLT
2008
15 years 2 months ago
2008
An aperiodic tile set was first constructed by R. Berger while proving the undecidability of the domino problem. It turned out that aperiodic tile sets appear in many topics rangin...
72
Voted
DLT
2008
15 years 2 months ago
2008
90
Voted
DLT
2008
15 years 2 months ago
2008
The present work clarifies the relation between domains of universal machines and r.e. prefix-free supersets of such sets. One such characterisation can be obtained in terms of the...
DLT
2008
15 years 2 months ago
2008
By the famous theorem of Morse and Hedlund, a word is ultimately periodic if and only if it has bounded subword complexity, i.e., for sufficiently large n, the number of factors of...
96
Voted
DLT
2008
15 years 2 months ago
2008
The classes of languages which are boolean combinations of languages of the form A a1A a2A . . . A a A , where a1, . . . , a A, k , for a fixed k 0, form a natural hierarchy wit...
62
Voted
DLT
2008
15 years 2 months ago
2008
55
Voted
DLT
2008
15 years 2 months ago
2008
58
Voted
DLT
2008
15 years 2 months ago
2008
62
Voted
DLT
2008
15 years 2 months ago
2008
