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Issue No. 04 - April (1979 vol. 1)
ISSN: 0162-8828
pp: 415-417
Akira Nakamura , Department of Applied Mathematics, Hiroshima University, Hiroshima, Japan; Computer Science Center, University of Maryland, College Park, MD 20742.
It is proved that the emptiness problem for deterministic bottom-up triangle acceptors (BTA's) over a single input symbol is recursively unsolvable. From this result, it is also shown that certain decision problems involving BTA's and BPA's (deterministic bottom-up pyramid acceptors) are unsolvable.

A. Nakamura, "Some Decision Problems for Bottom-Up Triangle Acceptors," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 1, no. , pp. 415-417, 1979.
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