no. 2
The communication hierarchy of time and space bounded parallel machines
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 37 (2003) no. 2, pp. 159-176.

We describe the communicating alternating machines and their simulation. We show that, in the case of communicating alternating machines which are bounded, simultaneously, by polynomial time and logarithmic space, the use of three communication levels instead of two does not increase computational power of communicating alternating machines. This resolves an open problem [2] concerning the exact position of machines with three communication levels in the hierarchy.

DOI : 10.1051/ita:2003012
Classification : 03D15
Mots clés : computational complexity, synchronized alternation 
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     title = {The communication hierarchy of time and space bounded parallel machines},
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Popély, Norbert. The communication hierarchy of time and space bounded parallel machines. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 37 (2003) no. 2, pp. 159-176. doi : 10.1051/ita:2003012. http://archive.numdam.org/articles/10.1051/ita:2003012/

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